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Finding the Fourth Proportional to 217,979.70, 326,726.55 and 84,815.70

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Solution

The fourth proportional to 217,979.70, 326,726.55 and 84,815.70 is: 127,129.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,979.70 : 326,726.55 = 84,815.70 : x
  2. Step 2: Convert to fraction form
    217,979.70/326,726.55 = 84,815.70/x
  3. Step 3: Cross multiply
    217,979.70x = 326,726.55 × 84,815.70
  4. Step 4: Simplify right side
    217,979.70x = 27,711,541,046.84
  5. Step 5: Solve for x
    x = 27,711,541,046.84/217,979.70
  6. Step 6: Final answer
    x = 127,129.00

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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.