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Finding the Fourth Proportional to 62.47, 86.15 and 42.79

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Solution

The fourth proportional to 62.47, 86.15 and 42.79 is: 59.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.47 : 86.15 = 42.79 : x
  2. Step 2: Convert to fraction form
    62.47/86.15 = 42.79/x
  3. Step 3: Cross multiply
    62.47x = 86.15 × 42.79
  4. Step 4: Simplify right side
    62.47x = 3,686.36
  5. Step 5: Solve for x
    x = 3,686.36/62.47
  6. Step 6: Final answer
    x = 59.01

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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.