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Finding the Fourth Proportional to 812.52, 1,121.28 and 463.20

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Solution

The fourth proportional to 812.52, 1,121.28 and 463.20 is: 639.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.52 : 1,121.28 = 463.20 : x
  2. Step 2: Convert to fraction form
    812.52/1,121.28 = 463.20/x
  3. Step 3: Cross multiply
    812.52x = 1,121.28 × 463.20
  4. Step 4: Simplify right side
    812.52x = 519,376.90
  5. Step 5: Solve for x
    x = 519,376.90/812.52
  6. Step 6: Final answer
    x = 639.22

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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.