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Finding the Fourth Proportional to 63.89, 88.64 and 63.29

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Solution

The fourth proportional to 63.89, 88.64 and 63.29 is: 87.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.89 : 88.64 = 63.29 : x
  2. Step 2: Convert to fraction form
    63.89/88.64 = 63.29/x
  3. Step 3: Cross multiply
    63.89x = 88.64 × 63.29
  4. Step 4: Simplify right side
    63.89x = 5,610.03
  5. Step 5: Solve for x
    x = 5,610.03/63.89
  6. Step 6: Final answer
    x = 87.81

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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.