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Finding the Fourth Proportional to 217,876.80, 326,931.30 and 84,761.40

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Solution

The fourth proportional to 217,876.80, 326,931.30 and 84,761.40 is: 127,187.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,876.80 : 326,931.30 = 84,761.40 : x
  2. Step 2: Convert to fraction form
    217,876.80/326,931.30 = 84,761.40/x
  3. Step 3: Cross multiply
    217,876.80x = 326,931.30 × 84,761.40
  4. Step 4: Simplify right side
    217,876.80x = 27,711,154,691.82
  5. Step 5: Solve for x
    x = 27,711,154,691.82/217,876.80
  6. Step 6: Final answer
    x = 127,187.27

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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.