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Finding the Fourth Proportional to 62.78, 86.66 and 39.46

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Solution

The fourth proportional to 62.78, 86.66 and 39.46 is: 54.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.78 : 86.66 = 39.46 : x
  2. Step 2: Convert to fraction form
    62.78/86.66 = 39.46/x
  3. Step 3: Cross multiply
    62.78x = 86.66 × 39.46
  4. Step 4: Simplify right side
    62.78x = 3,418.97
  5. Step 5: Solve for x
    x = 3,418.97/62.78
  6. Step 6: Final answer
    x = 54.46

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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.