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Finding the Fourth Proportional to 518,441.34, 715,649.68 and 405,300.54

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Solution

The fourth proportional to 518,441.34, 715,649.68 and 405,300.54 is: 559,471.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,441.34 : 715,649.68 = 405,300.54 : x
  2. Step 2: Convert to fraction form
    518,441.34/715,649.68 = 405,300.54/x
  3. Step 3: Cross multiply
    518,441.34x = 715,649.68 × 405,300.54
  4. Step 4: Simplify right side
    518,441.34x = 290,053,201,754.83
  5. Step 5: Solve for x
    x = 290,053,201,754.83/518,441.34
  6. Step 6: Final answer
    x = 559,471.59

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.