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Finding the Fourth Proportional to 81,136.82, 121,691.19 and 21,958.67

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Solution

The fourth proportional to 81,136.82, 121,691.19 and 21,958.67 is: 32,934.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,136.82 : 121,691.19 = 21,958.67 : x
  2. Step 2: Convert to fraction form
    81,136.82/121,691.19 = 21,958.67/x
  3. Step 3: Cross multiply
    81,136.82x = 121,691.19 × 21,958.67
  4. Step 4: Simplify right side
    81,136.82x = 2,672,176,683.12
  5. Step 5: Solve for x
    x = 2,672,176,683.12/81,136.82
  6. Step 6: Final answer
    x = 32,934.21

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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.