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Finding the Fourth Proportional to 438,470.40, 656,393.40 and 391,231.20

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Solution

The fourth proportional to 438,470.40, 656,393.40 and 391,231.20 is: 585,675.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,470.40 : 656,393.40 = 391,231.20 : x
  2. Step 2: Convert to fraction form
    438,470.40/656,393.40 = 391,231.20/x
  3. Step 3: Cross multiply
    438,470.40x = 656,393.40 × 391,231.20
  4. Step 4: Simplify right side
    438,470.40x = 256,801,577,554.08
  5. Step 5: Solve for x
    x = 256,801,577,554.08/438,470.40
  6. Step 6: Final answer
    x = 585,675.97

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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.