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Finding the Fourth Proportional to 159,599.72, 220,244.85 and 87,986.40

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Solution

The fourth proportional to 159,599.72, 220,244.85 and 87,986.40 is: 121,419.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,599.72 : 220,244.85 = 87,986.40 : x
  2. Step 2: Convert to fraction form
    159,599.72/220,244.85 = 87,986.40/x
  3. Step 3: Cross multiply
    159,599.72x = 220,244.85 × 87,986.40
  4. Step 4: Simplify right side
    159,599.72x = 19,378,551,470.04
  5. Step 5: Solve for x
    x = 19,378,551,470.04/159,599.72
  6. Step 6: Final answer
    x = 121,419.71

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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.