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Finding the Fourth Proportional to 62.78, 87.06 and 60.74

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Solution

The fourth proportional to 62.78, 87.06 and 60.74 is: 84.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.78 : 87.06 = 60.74 : x
  2. Step 2: Convert to fraction form
    62.78/87.06 = 60.74/x
  3. Step 3: Cross multiply
    62.78x = 87.06 × 60.74
  4. Step 4: Simplify right side
    62.78x = 5,287.59
  5. Step 5: Solve for x
    x = 5,287.59/62.78
  6. Step 6: Final answer
    x = 84.22

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.