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Finding the Fourth Proportional to 86,572.20, 129,858.30 and 82,489.80

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Solution

The fourth proportional to 86,572.20, 129,858.30 and 82,489.80 is: 123,734.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,572.20 : 129,858.30 = 82,489.80 : x
  2. Step 2: Convert to fraction form
    86,572.20/129,858.30 = 82,489.80/x
  3. Step 3: Cross multiply
    86,572.20x = 129,858.30 × 82,489.80
  4. Step 4: Simplify right side
    86,572.20x = 10,711,985,195.34
  5. Step 5: Solve for x
    x = 10,711,985,195.34/86,572.20
  6. Step 6: Final answer
    x = 123,734.70

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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.