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Finding the Fourth Proportional to 18,195.20, 27,278.40 and 9,987.20

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Solution

The fourth proportional to 18,195.20, 27,278.40 and 9,987.20 is: 14,972.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,195.20 : 27,278.40 = 9,987.20 : x
  2. Step 2: Convert to fraction form
    18,195.20/27,278.40 = 9,987.20/x
  3. Step 3: Cross multiply
    18,195.20x = 27,278.40 × 9,987.20
  4. Step 4: Simplify right side
    18,195.20x = 272,434,836.48
  5. Step 5: Solve for x
    x = 272,434,836.48/18,195.20
  6. Step 6: Final answer
    x = 14,972.90

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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.