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Finding the Fourth Proportional to 129,471.20, 194,206.80 and 87,999.20

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Solution

The fourth proportional to 129,471.20, 194,206.80 and 87,999.20 is: 131,998.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,471.20 : 194,206.80 = 87,999.20 : x
  2. Step 2: Convert to fraction form
    129,471.20/194,206.80 = 87,999.20/x
  3. Step 3: Cross multiply
    129,471.20x = 194,206.80 × 87,999.20
  4. Step 4: Simplify right side
    129,471.20x = 17,090,043,034.56
  5. Step 5: Solve for x
    x = 17,090,043,034.56/129,471.20
  6. Step 6: Final answer
    x = 131,998.80

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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.