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Finding the Fourth Proportional to 747.32, 1,121.15 and 253.71

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Solution

The fourth proportional to 747.32, 1,121.15 and 253.71 is: 380.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.32 : 1,121.15 = 253.71 : x
  2. Step 2: Convert to fraction form
    747.32/1,121.15 = 253.71/x
  3. Step 3: Cross multiply
    747.32x = 1,121.15 × 253.71
  4. Step 4: Simplify right side
    747.32x = 284,451.81
  5. Step 5: Solve for x
    x = 284,451.81/747.32
  6. Step 6: Final answer
    x = 380.63

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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.