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Finding the Fourth Proportional to 951.68, 1,313.12 and 715.88

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Solution

The fourth proportional to 951.68, 1,313.12 and 715.88 is: 987.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    951.68 : 1,313.12 = 715.88 : x
  2. Step 2: Convert to fraction form
    951.68/1,313.12 = 715.88/x
  3. Step 3: Cross multiply
    951.68x = 1,313.12 × 715.88
  4. Step 4: Simplify right side
    951.68x = 940,036.35
  5. Step 5: Solve for x
    x = 940,036.35/951.68
  6. Step 6: Final answer
    x = 987.77

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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.