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Finding the Fourth Proportional to 80,673.40, 120,981.30 and 28,084.60

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Solution

The fourth proportional to 80,673.40, 120,981.30 and 28,084.60 is: 42,116.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,673.40 : 120,981.30 = 28,084.60 : x
  2. Step 2: Convert to fraction form
    80,673.40/120,981.30 = 28,084.60/x
  3. Step 3: Cross multiply
    80,673.40x = 120,981.30 × 28,084.60
  4. Step 4: Simplify right side
    80,673.40x = 3,397,711,417.98
  5. Step 5: Solve for x
    x = 3,397,711,417.98/80,673.40
  6. Step 6: Final answer
    x = 42,116.87

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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.