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Finding the Fourth Proportional to 80,715.80, 121,016.10 and 36,306.20

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Solution

The fourth proportional to 80,715.80, 121,016.10 and 36,306.20 is: 54,433.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,715.80 : 121,016.10 = 36,306.20 : x
  2. Step 2: Convert to fraction form
    80,715.80/121,016.10 = 36,306.20/x
  3. Step 3: Cross multiply
    80,715.80x = 121,016.10 × 36,306.20
  4. Step 4: Simplify right side
    80,715.80x = 4,393,634,729.82
  5. Step 5: Solve for x
    x = 4,393,634,729.82/80,715.80
  6. Step 6: Final answer
    x = 54,433.39

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1.5x scale

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.