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Finding the Fourth Proportional to 747.86, 1,119.60 and 487.13

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Solution

The fourth proportional to 747.86, 1,119.60 and 487.13 is: 729.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.86 : 1,119.60 = 487.13 : x
  2. Step 2: Convert to fraction form
    747.86/1,119.60 = 487.13/x
  3. Step 3: Cross multiply
    747.86x = 1,119.60 × 487.13
  4. Step 4: Simplify right side
    747.86x = 545,385.15
  5. Step 5: Solve for x
    x = 545,385.15/747.86
  6. Step 6: Final answer
    x = 729.27

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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.