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Finding the Fourth Proportional to 143,934.80, 215,902.20 and 81,726.80

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Solution

The fourth proportional to 143,934.80, 215,902.20 and 81,726.80 is: 122,590.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,934.80 : 215,902.20 = 81,726.80 : x
  2. Step 2: Convert to fraction form
    143,934.80/215,902.20 = 81,726.80/x
  3. Step 3: Cross multiply
    143,934.80x = 215,902.20 × 81,726.80
  4. Step 4: Simplify right side
    143,934.80x = 17,644,995,918.96
  5. Step 5: Solve for x
    x = 17,644,995,918.96/143,934.80
  6. Step 6: Final answer
    x = 122,590.20

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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.