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Finding the Fourth Proportional to 482.88, 724.31 and 140.88

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Solution

The fourth proportional to 482.88, 724.31 and 140.88 is: 211.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    482.88 : 724.31 = 140.88 : x
  2. Step 2: Convert to fraction form
    482.88/724.31 = 140.88/x
  3. Step 3: Cross multiply
    482.88x = 724.31 × 140.88
  4. Step 4: Simplify right side
    482.88x = 102,040.79
  5. Step 5: Solve for x
    x = 102,040.79/482.88
  6. Step 6: Final answer
    x = 211.32

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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.