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Finding the Fourth Proportional to 691.48, 1,043.17 and 657.28

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Solution

The fourth proportional to 691.48, 1,043.17 and 657.28 is: 991.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.48 : 1,043.17 = 657.28 : x
  2. Step 2: Convert to fraction form
    691.48/1,043.17 = 657.28/x
  3. Step 3: Cross multiply
    691.48x = 1,043.17 × 657.28
  4. Step 4: Simplify right side
    691.48x = 685,654.78
  5. Step 5: Solve for x
    x = 685,654.78/691.48
  6. Step 6: Final answer
    x = 991.58

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.