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Finding the Fourth Proportional to 747.87, 1,119.71 and 381.87

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Solution

The fourth proportional to 747.87, 1,119.71 and 381.87 is: 571.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.87 : 1,119.71 = 381.87 : x
  2. Step 2: Convert to fraction form
    747.87/1,119.71 = 381.87/x
  3. Step 3: Cross multiply
    747.87x = 1,119.71 × 381.87
  4. Step 4: Simplify right side
    747.87x = 427,581.75
  5. Step 5: Solve for x
    x = 427,581.75/747.87
  6. Step 6: Final answer
    x = 571.73

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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.