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Finding the Fourth Proportional to 81.35, 121.85 and 63.03

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Solution

The fourth proportional to 81.35, 121.85 and 63.03 is: 94.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.35 : 121.85 = 63.03 : x
  2. Step 2: Convert to fraction form
    81.35/121.85 = 63.03/x
  3. Step 3: Cross multiply
    81.35x = 121.85 × 63.03
  4. Step 4: Simplify right side
    81.35x = 7,680.25
  5. Step 5: Solve for x
    x = 7,680.25/81.35
  6. Step 6: Final answer
    x = 94.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.