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Finding the Fourth Proportional to 691.57, 1,038.59 and 432.07

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Solution

The fourth proportional to 691.57, 1,038.59 and 432.07 is: 648.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.57 : 1,038.59 = 432.07 : x
  2. Step 2: Convert to fraction form
    691.57/1,038.59 = 432.07/x
  3. Step 3: Cross multiply
    691.57x = 1,038.59 × 432.07
  4. Step 4: Simplify right side
    691.57x = 448,743.58
  5. Step 5: Solve for x
    x = 448,743.58/691.57
  6. Step 6: Final answer
    x = 648.88

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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.