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Finding the Fourth Proportional to 158,387.40, 218,578.50 and 86,767.61

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Solution

The fourth proportional to 158,387.40, 218,578.50 and 86,767.61 is: 119,741.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,387.40 : 218,578.50 = 86,767.61 : x
  2. Step 2: Convert to fraction form
    158,387.40/218,578.50 = 86,767.61/x
  3. Step 3: Cross multiply
    158,387.40x = 218,578.50 × 86,767.61
  4. Step 4: Simplify right side
    158,387.40x = 18,965,532,949.49
  5. Step 5: Solve for x
    x = 18,965,532,949.49/158,387.40
  6. Step 6: Final answer
    x = 119,741.42

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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.