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Finding the Fourth Proportional to 86,427.28, 129,640.89 and 20,763.28

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Solution

The fourth proportional to 86,427.28, 129,640.89 and 20,763.28 is: 31,144.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,427.28 : 129,640.89 = 20,763.28 : x
  2. Step 2: Convert to fraction form
    86,427.28/129,640.89 = 20,763.28/x
  3. Step 3: Cross multiply
    86,427.28x = 129,640.89 × 20,763.28
  4. Step 4: Simplify right side
    86,427.28x = 2,691,770,098.52
  5. Step 5: Solve for x
    x = 2,691,770,098.52/86,427.28
  6. Step 6: Final answer
    x = 31,144.91

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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.