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Finding the Fourth Proportional to 792.40, 1,092 and 688.72

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Solution

The fourth proportional to 792.40, 1,092 and 688.72 is: 949.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.40 : 1,092 = 688.72 : x
  2. Step 2: Convert to fraction form
    792.40/1,092 = 688.72/x
  3. Step 3: Cross multiply
    792.40x = 1,092 × 688.72
  4. Step 4: Simplify right side
    792.40x = 752,082.24
  5. Step 5: Solve for x
    x = 752,082.24/792.40
  6. Step 6: Final answer
    x = 949.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.