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Finding the Fourth Proportional to 1,321.38, 1,979.34 and 956.88

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Solution

The fourth proportional to 1,321.38, 1,979.34 and 956.88 is: 1,433.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.38 : 1,979.34 = 956.88 : x
  2. Step 2: Convert to fraction form
    1,321.38/1,979.34 = 956.88/x
  3. Step 3: Cross multiply
    1,321.38x = 1,979.34 × 956.88
  4. Step 4: Simplify right side
    1,321.38x = 1,893,990.86
  5. Step 5: Solve for x
    x = 1,893,990.86/1,321.38
  6. Step 6: Final answer
    x = 1,433.34

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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.