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Finding the Fourth Proportional to 691.92, 1,038 and 417.60

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Solution

The fourth proportional to 691.92, 1,038 and 417.60 is: 626.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.92 : 1,038 = 417.60 : x
  2. Step 2: Convert to fraction form
    691.92/1,038 = 417.60/x
  3. Step 3: Cross multiply
    691.92x = 1,038 × 417.60
  4. Step 4: Simplify right side
    691.92x = 433,468.80
  5. Step 5: Solve for x
    x = 433,468.80/691.92
  6. Step 6: Final answer
    x = 626.47

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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.