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Finding the Fourth Proportional to 217,690.92, 326,662.50 and 91,320

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Solution

The fourth proportional to 217,690.92, 326,662.50 and 91,320 is: 137,032.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,690.92 : 326,662.50 = 91,320 : x
  2. Step 2: Convert to fraction form
    217,690.92/326,662.50 = 91,320/x
  3. Step 3: Cross multiply
    217,690.92x = 326,662.50 × 91,320
  4. Step 4: Simplify right side
    217,690.92x = 29,830,819,500
  5. Step 5: Solve for x
    x = 29,830,819,500/217,690.92
  6. Step 6: Final answer
    x = 137,032.91

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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.