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Finding the Fourth Proportional to 81.53, 122.17 and 64.34

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Solution

The fourth proportional to 81.53, 122.17 and 64.34 is: 96.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.53 : 122.17 = 64.34 : x
  2. Step 2: Convert to fraction form
    81.53/122.17 = 64.34/x
  3. Step 3: Cross multiply
    81.53x = 122.17 × 64.34
  4. Step 4: Simplify right side
    81.53x = 7,860.42
  5. Step 5: Solve for x
    x = 7,860.42/81.53
  6. Step 6: Final answer
    x = 96.41

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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.