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Finding the Fourth Proportional to 86,618.88, 129,928.31 and 20,954.88

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Solution

The fourth proportional to 86,618.88, 129,928.31 and 20,954.88 is: 31,432.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,618.88 : 129,928.31 = 20,954.88 : x
  2. Step 2: Convert to fraction form
    86,618.88/129,928.31 = 20,954.88/x
  3. Step 3: Cross multiply
    86,618.88x = 129,928.31 × 20,954.88
  4. Step 4: Simplify right side
    86,618.88x = 2,722,632,144.65
  5. Step 5: Solve for x
    x = 2,722,632,144.65/86,618.88
  6. Step 6: Final answer
    x = 31,432.32

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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.