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Finding the Fourth Proportional to 18,805.60, 25,949.92 and 11,250.40

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Solution

The fourth proportional to 18,805.60, 25,949.92 and 11,250.40 is: 15,524.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,805.60 : 25,949.92 = 11,250.40 : x
  2. Step 2: Convert to fraction form
    18,805.60/25,949.92 = 11,250.40/x
  3. Step 3: Cross multiply
    18,805.60x = 25,949.92 × 11,250.40
  4. Step 4: Simplify right side
    18,805.60x = 291,946,979.97
  5. Step 5: Solve for x
    x = 291,946,979.97/18,805.60
  6. Step 6: Final answer
    x = 15,524.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.