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Finding the Fourth Proportional to 742.55, 1,024.20 and 480.32

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Solution

The fourth proportional to 742.55, 1,024.20 and 480.32 is: 662.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.55 : 1,024.20 = 480.32 : x
  2. Step 2: Convert to fraction form
    742.55/1,024.20 = 480.32/x
  3. Step 3: Cross multiply
    742.55x = 1,024.20 × 480.32
  4. Step 4: Simplify right side
    742.55x = 491,943.74
  5. Step 5: Solve for x
    x = 491,943.74/742.55
  6. Step 6: Final answer
    x = 662.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.