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Finding the Fourth Proportional to 127,965.20, 191,947.80 and 85,974.80

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Solution

The fourth proportional to 127,965.20, 191,947.80 and 85,974.80 is: 128,962.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,965.20 : 191,947.80 = 85,974.80 : x
  2. Step 2: Convert to fraction form
    127,965.20/191,947.80 = 85,974.80/x
  3. Step 3: Cross multiply
    127,965.20x = 191,947.80 × 85,974.80
  4. Step 4: Simplify right side
    127,965.20x = 16,502,673,715.44
  5. Step 5: Solve for x
    x = 16,502,673,715.44/127,965.20
  6. Step 6: Final answer
    x = 128,962.20

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Similar ratio
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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.