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Finding the Fourth Proportional to 158,690.56, 218,989.20 and 87,069.92

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Solution

The fourth proportional to 158,690.56, 218,989.20 and 87,069.92 is: 120,154.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,690.56 : 218,989.20 = 87,069.92 : x
  2. Step 2: Convert to fraction form
    158,690.56/218,989.20 = 87,069.92/x
  3. Step 3: Cross multiply
    158,690.56x = 218,989.20 × 87,069.92
  4. Step 4: Simplify right side
    158,690.56x = 19,067,372,124.86
  5. Step 5: Solve for x
    x = 19,067,372,124.86/158,690.56
  6. Step 6: Final answer
    x = 120,154.42

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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.