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Finding the Fourth Proportional to 438,553.40, 656,517.90 and 391,314.20

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Solution

The fourth proportional to 438,553.40, 656,517.90 and 391,314.20 is: 585,800.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,553.40 : 656,517.90 = 391,314.20 : x
  2. Step 2: Convert to fraction form
    438,553.40/656,517.90 = 391,314.20/x
  3. Step 3: Cross multiply
    438,553.40x = 656,517.90 × 391,314.20
  4. Step 4: Simplify right side
    438,553.40x = 256,904,776,824.18
  5. Step 5: Solve for x
    x = 256,904,776,824.18/438,553.40
  6. Step 6: Final answer
    x = 585,800.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.