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Finding the Fourth Proportional to 217,691.92, 326,664 and 91,321

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Solution

The fourth proportional to 217,691.92, 326,664 and 91,321 is: 137,034.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,691.92 : 326,664 = 91,321 : x
  2. Step 2: Convert to fraction form
    217,691.92/326,664 = 91,321/x
  3. Step 3: Cross multiply
    217,691.92x = 326,664 × 91,321
  4. Step 4: Simplify right side
    217,691.92x = 29,831,283,144
  5. Step 5: Solve for x
    x = 29,831,283,144/217,691.92
  6. Step 6: Final answer
    x = 137,034.41

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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.