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Finding the Fourth Proportional to 63.88, 87.66 and 63.25

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Solution

The fourth proportional to 63.88, 87.66 and 63.25 is: 86.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.88 : 87.66 = 63.25 : x
  2. Step 2: Convert to fraction form
    63.88/87.66 = 63.25/x
  3. Step 3: Cross multiply
    63.88x = 87.66 × 63.25
  4. Step 4: Simplify right side
    63.88x = 5,544.50
  5. Step 5: Solve for x
    x = 5,544.50/63.88
  6. Step 6: Final answer
    x = 86.80

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.