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Finding the Fourth Proportional to 956.57, 1,431.44 and 749.72

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Solution

The fourth proportional to 956.57, 1,431.44 and 749.72 is: 1,121.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.57 : 1,431.44 = 749.72 : x
  2. Step 2: Convert to fraction form
    956.57/1,431.44 = 749.72/x
  3. Step 3: Cross multiply
    956.57x = 1,431.44 × 749.72
  4. Step 4: Simplify right side
    956.57x = 1,073,176.47
  5. Step 5: Solve for x
    x = 1,073,176.47/956.57
  6. Step 6: Final answer
    x = 1,121.90

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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.