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Finding the Fourth Proportional to 97.78, 134.87 and 63.28

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Solution

The fourth proportional to 97.78, 134.87 and 63.28 is: 87.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.78 : 134.87 = 63.28 : x
  2. Step 2: Convert to fraction form
    97.78/134.87 = 63.28/x
  3. Step 3: Cross multiply
    97.78x = 134.87 × 63.28
  4. Step 4: Simplify right side
    97.78x = 8,534.57
  5. Step 5: Solve for x
    x = 8,534.57/97.78
  6. Step 6: Final answer
    x = 87.28

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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.