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Finding the Fourth Proportional to 158,419.13, 218,618.46 and 86,801.90

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Solution

The fourth proportional to 158,419.13, 218,618.46 and 86,801.90 is: 119,786.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,419.13 : 218,618.46 = 86,801.90 : x
  2. Step 2: Convert to fraction form
    158,419.13/218,618.46 = 86,801.90/x
  3. Step 3: Cross multiply
    158,419.13x = 218,618.46 × 86,801.90
  4. Step 4: Simplify right side
    158,419.13x = 18,976,496,609.98
  5. Step 5: Solve for x
    x = 18,976,496,609.98/158,419.13
  6. Step 6: Final answer
    x = 119,786.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.