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Finding the Fourth Proportional to 217,689.81, 326,660.83 and 91,318.88

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Solution

The fourth proportional to 217,689.81, 326,660.83 and 91,318.88 is: 137,031.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,689.81 : 326,660.83 = 91,318.88 : x
  2. Step 2: Convert to fraction form
    217,689.81/326,660.83 = 91,318.88/x
  3. Step 3: Cross multiply
    217,689.81x = 326,660.83 × 91,318.88
  4. Step 4: Simplify right side
    217,689.81x = 29,830,299,273.87
  5. Step 5: Solve for x
    x = 29,830,299,273.87/217,689.81
  6. Step 6: Final answer
    x = 137,031.22

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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.