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Finding the Fourth Proportional to 83,905.40, 125,858.10 and 80,679.80

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Solution

The fourth proportional to 83,905.40, 125,858.10 and 80,679.80 is: 121,019.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,905.40 : 125,858.10 = 80,679.80 : x
  2. Step 2: Convert to fraction form
    83,905.40/125,858.10 = 80,679.80/x
  3. Step 3: Cross multiply
    83,905.40x = 125,858.10 × 80,679.80
  4. Step 4: Simplify right side
    83,905.40x = 10,154,206,336.38
  5. Step 5: Solve for x
    x = 10,154,206,336.38/83,905.40
  6. Step 6: Final answer
    x = 121,019.70

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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.