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Finding the Fourth Proportional to 688.38, 1,031.38 and 579.38

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Solution

The fourth proportional to 688.38, 1,031.38 and 579.38 is: 868.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.38 : 1,031.38 = 579.38 : x
  2. Step 2: Convert to fraction form
    688.38/1,031.38 = 579.38/x
  3. Step 3: Cross multiply
    688.38x = 1,031.38 × 579.38
  4. Step 4: Simplify right side
    688.38x = 597,560.94
  5. Step 5: Solve for x
    x = 597,560.94/688.38
  6. Step 6: Final answer
    x = 868.07

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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.