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Finding the Fourth Proportional to 80,867.70, 121,301.55 and 79,139.70

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Solution

The fourth proportional to 80,867.70, 121,301.55 and 79,139.70 is: 118,709.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,867.70 : 121,301.55 = 79,139.70 : x
  2. Step 2: Convert to fraction form
    80,867.70/121,301.55 = 79,139.70/x
  3. Step 3: Cross multiply
    80,867.70x = 121,301.55 × 79,139.70
  4. Step 4: Simplify right side
    80,867.70x = 9,599,768,276.54
  5. Step 5: Solve for x
    x = 9,599,768,276.54/80,867.70
  6. Step 6: Final answer
    x = 118,709.55

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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.