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Finding the Fourth Proportional to 80,679.40, 121,040.70 and 71,974.60

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Solution

The fourth proportional to 80,679.40, 121,040.70 and 71,974.60 is: 107,981.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,679.40 : 121,040.70 = 71,974.60 : x
  2. Step 2: Convert to fraction form
    80,679.40/121,040.70 = 71,974.60/x
  3. Step 3: Cross multiply
    80,679.40x = 121,040.70 × 71,974.60
  4. Step 4: Simplify right side
    80,679.40x = 8,711,855,966.22
  5. Step 5: Solve for x
    x = 8,711,855,966.22/80,679.40
  6. Step 6: Final answer
    x = 107,981.17

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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.