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Finding the Fourth Proportional to 747.91, 1,121.31 and 455.48

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Solution

The fourth proportional to 747.91, 1,121.31 and 455.48 is: 682.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.91 : 1,121.31 = 455.48 : x
  2. Step 2: Convert to fraction form
    747.91/1,121.31 = 455.48/x
  3. Step 3: Cross multiply
    747.91x = 1,121.31 × 455.48
  4. Step 4: Simplify right side
    747.91x = 510,734.28
  5. Step 5: Solve for x
    x = 510,734.28/747.91
  6. Step 6: Final answer
    x = 682.88

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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.