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Finding the Fourth Proportional to 103,398.92, 155,231.21 and 79,721.51

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Solution

The fourth proportional to 103,398.92, 155,231.21 and 79,721.51 is: 119,684.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,398.92 : 155,231.21 = 79,721.51 : x
  2. Step 2: Convert to fraction form
    103,398.92/155,231.21 = 79,721.51/x
  3. Step 3: Cross multiply
    103,398.92x = 155,231.21 × 79,721.51
  4. Step 4: Simplify right side
    103,398.92x = 12,375,266,449.80
  5. Step 5: Solve for x
    x = 12,375,266,449.80/103,398.92
  6. Step 6: Final answer
    x = 119,684.68

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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.