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Finding the Fourth Proportional to 956.43, 1,319.13 and 721.17

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Solution

The fourth proportional to 956.43, 1,319.13 and 721.17 is: 994.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.43 : 1,319.13 = 721.17 : x
  2. Step 2: Convert to fraction form
    956.43/1,319.13 = 721.17/x
  3. Step 3: Cross multiply
    956.43x = 1,319.13 × 721.17
  4. Step 4: Simplify right side
    956.43x = 951,316.98
  5. Step 5: Solve for x
    x = 951,316.98/956.43
  6. Step 6: Final answer
    x = 994.65

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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.