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Finding the Fourth Proportional to 63.56, 88.18 and 61.40

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Solution

The fourth proportional to 63.56, 88.18 and 61.40 is: 85.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.56 : 88.18 = 61.40 : x
  2. Step 2: Convert to fraction form
    63.56/88.18 = 61.40/x
  3. Step 3: Cross multiply
    63.56x = 88.18 × 61.40
  4. Step 4: Simplify right side
    63.56x = 5,414.25
  5. Step 5: Solve for x
    x = 5,414.25/63.56
  6. Step 6: Final answer
    x = 85.18

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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.