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Finding the Fourth Proportional to 60.97, 84.12 and 49.78

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Solution

The fourth proportional to 60.97, 84.12 and 49.78 is: 68.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.97 : 84.12 = 49.78 : x
  2. Step 2: Convert to fraction form
    60.97/84.12 = 49.78/x
  3. Step 3: Cross multiply
    60.97x = 84.12 × 49.78
  4. Step 4: Simplify right side
    60.97x = 4,187.49
  5. Step 5: Solve for x
    x = 4,187.49/60.97
  6. Step 6: Final answer
    x = 68.68

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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.