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Finding the Fourth Proportional to 126,043.20, 189,064.80 and 90,613.80

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Solution

The fourth proportional to 126,043.20, 189,064.80 and 90,613.80 is: 135,920.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,043.20 : 189,064.80 = 90,613.80 : x
  2. Step 2: Convert to fraction form
    126,043.20/189,064.80 = 90,613.80/x
  3. Step 3: Cross multiply
    126,043.20x = 189,064.80 × 90,613.80
  4. Step 4: Simplify right side
    126,043.20x = 17,131,879,974.24
  5. Step 5: Solve for x
    x = 17,131,879,974.24/126,043.20
  6. Step 6: Final answer
    x = 135,920.70

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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.