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Finding the Fourth Proportional to 129,685.40, 194,220.90 and 87,906.20

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Solution

The fourth proportional to 129,685.40, 194,220.90 and 87,906.20 is: 131,651.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,685.40 : 194,220.90 = 87,906.20 : x
  2. Step 2: Convert to fraction form
    129,685.40/194,220.90 = 87,906.20/x
  3. Step 3: Cross multiply
    129,685.40x = 194,220.90 × 87,906.20
  4. Step 4: Simplify right side
    129,685.40x = 17,073,221,279.58
  5. Step 5: Solve for x
    x = 17,073,221,279.58/129,685.40
  6. Step 6: Final answer
    x = 131,651.07

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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.