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Finding the Fourth Proportional to 62.88, 86.76 and 39.24

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Solution

The fourth proportional to 62.88, 86.76 and 39.24 is: 54.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.88 : 86.76 = 39.24 : x
  2. Step 2: Convert to fraction form
    62.88/86.76 = 39.24/x
  3. Step 3: Cross multiply
    62.88x = 86.76 × 39.24
  4. Step 4: Simplify right side
    62.88x = 3,404.46
  5. Step 5: Solve for x
    x = 3,404.46/62.88
  6. Step 6: Final answer
    x = 54.14

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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.