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Finding the Fourth Proportional to 438,140.80, 656,498.40 and 396,150.40

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Solution

The fourth proportional to 438,140.80, 656,498.40 and 396,150.40 is: 593,581.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,140.80 : 656,498.40 = 396,150.40 : x
  2. Step 2: Convert to fraction form
    438,140.80/656,498.40 = 396,150.40/x
  3. Step 3: Cross multiply
    438,140.80x = 656,498.40 × 396,150.40
  4. Step 4: Simplify right side
    438,140.80x = 260,072,103,759.36
  5. Step 5: Solve for x
    x = 260,072,103,759.36/438,140.80
  6. Step 6: Final answer
    x = 593,581.11

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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.