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Finding the Fourth Proportional to 42.06, 62.67 and 39.86

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Solution

The fourth proportional to 42.06, 62.67 and 39.86 is: 59.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.06 : 62.67 = 39.86 : x
  2. Step 2: Convert to fraction form
    42.06/62.67 = 39.86/x
  3. Step 3: Cross multiply
    42.06x = 62.67 × 39.86
  4. Step 4: Simplify right side
    42.06x = 2,498.03
  5. Step 5: Solve for x
    x = 2,498.03/42.06
  6. Step 6: Final answer
    x = 59.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.