Home / 642,141.07-886,161.21-387,443.05

Finding the Fourth Proportional to 642,141.07, 886,161.21 and 387,443.05

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Solution

The fourth proportional to 642,141.07, 886,161.21 and 387,443.05 is: 534,675.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,141.07 : 886,161.21 = 387,443.05 : x
  2. Step 2: Convert to fraction form
    642,141.07/886,161.21 = 387,443.05/x
  3. Step 3: Cross multiply
    642,141.07x = 886,161.21 × 387,443.05
  4. Step 4: Simplify right side
    642,141.07x = 343,337,001,994.09
  5. Step 5: Solve for x
    x = 343,337,001,994.09/642,141.07
  6. Step 6: Final answer
    x = 534,675.35

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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.