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Finding the Fourth Proportional to 62.98, 86.89 and 39.34

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Solution

The fourth proportional to 62.98, 86.89 and 39.34 is: 54.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.98 : 86.89 = 39.34 : x
  2. Step 2: Convert to fraction form
    62.98/86.89 = 39.34/x
  3. Step 3: Cross multiply
    62.98x = 86.89 × 39.34
  4. Step 4: Simplify right side
    62.98x = 3,418.25
  5. Step 5: Solve for x
    x = 3,418.25/62.98
  6. Step 6: Final answer
    x = 54.28

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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.