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Finding the Fourth Proportional to 747.25, 1,120.82 and 253.70

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Solution

The fourth proportional to 747.25, 1,120.82 and 253.70 is: 380.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.25 : 1,120.82 = 253.70 : x
  2. Step 2: Convert to fraction form
    747.25/1,120.82 = 253.70/x
  3. Step 3: Cross multiply
    747.25x = 1,120.82 × 253.70
  4. Step 4: Simplify right side
    747.25x = 284,349.36
  5. Step 5: Solve for x
    x = 284,349.36/747.25
  6. Step 6: Final answer
    x = 380.53

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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.