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Finding the Fourth Proportional to 691.68, 1,042.26 and 572.58

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Solution

The fourth proportional to 691.68, 1,042.26 and 572.58 is: 862.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.68 : 1,042.26 = 572.58 : x
  2. Step 2: Convert to fraction form
    691.68/1,042.26 = 572.58/x
  3. Step 3: Cross multiply
    691.68x = 1,042.26 × 572.58
  4. Step 4: Simplify right side
    691.68x = 596,777.23
  5. Step 5: Solve for x
    x = 596,777.23/691.68
  6. Step 6: Final answer
    x = 862.79

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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.