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Finding the Fourth Proportional to 816.39, 1,126.74 and 619.56

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Solution

The fourth proportional to 816.39, 1,126.74 and 619.56 is: 855.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.39 : 1,126.74 = 619.56 : x
  2. Step 2: Convert to fraction form
    816.39/1,126.74 = 619.56/x
  3. Step 3: Cross multiply
    816.39x = 1,126.74 × 619.56
  4. Step 4: Simplify right side
    816.39x = 698,083.03
  5. Step 5: Solve for x
    x = 698,083.03/816.39
  6. Step 6: Final answer
    x = 855.09

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Double scale
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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.