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Finding the Fourth Proportional to 80,639.70, 120,861.14 and 45,506.76

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Solution

The fourth proportional to 80,639.70, 120,861.14 and 45,506.76 is: 68,204.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,639.70 : 120,861.14 = 45,506.76 : x
  2. Step 2: Convert to fraction form
    80,639.70/120,861.14 = 45,506.76/x
  3. Step 3: Cross multiply
    80,639.70x = 120,861.14 × 45,506.76
  4. Step 4: Simplify right side
    80,639.70x = 5,499,998,663.77
  5. Step 5: Solve for x
    x = 5,499,998,663.77/80,639.70
  6. Step 6: Final answer
    x = 68,204.60

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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.