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Finding the Fourth Proportional to 428,908.71, 643,367.68 and 129,391.88

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Solution

The fourth proportional to 428,908.71, 643,367.68 and 129,391.88 is: 194,089.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,908.71 : 643,367.68 = 129,391.88 : x
  2. Step 2: Convert to fraction form
    428,908.71/643,367.68 = 129,391.88/x
  3. Step 3: Cross multiply
    428,908.71x = 643,367.68 × 129,391.88
  4. Step 4: Simplify right side
    428,908.71x = 83,246,553,646.44
  5. Step 5: Solve for x
    x = 83,246,553,646.44/428,908.71
  6. Step 6: Final answer
    x = 194,089.21

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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.