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Finding the Fourth Proportional to 68,726.40, 103,105.80 and 21,979.68

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Solution

The fourth proportional to 68,726.40, 103,105.80 and 21,979.68 is: 32,974.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,726.40 : 103,105.80 = 21,979.68 : x
  2. Step 2: Convert to fraction form
    68,726.40/103,105.80 = 21,979.68/x
  3. Step 3: Cross multiply
    68,726.40x = 103,105.80 × 21,979.68
  4. Step 4: Simplify right side
    68,726.40x = 2,266,232,490.14
  5. Step 5: Solve for x
    x = 2,266,232,490.14/68,726.40
  6. Step 6: Final answer
    x = 32,974.70

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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.