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Finding the Fourth Proportional to 18,119.98, 27,139.80 and 13,929.16

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Solution

The fourth proportional to 18,119.98, 27,139.80 and 13,929.16 is: 20,862.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,119.98 : 27,139.80 = 13,929.16 : x
  2. Step 2: Convert to fraction form
    18,119.98/27,139.80 = 13,929.16/x
  3. Step 3: Cross multiply
    18,119.98x = 27,139.80 × 13,929.16
  4. Step 4: Simplify right side
    18,119.98x = 378,034,616.57
  5. Step 5: Solve for x
    x = 378,034,616.57/18,119.98
  6. Step 6: Final answer
    x = 20,862.86

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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.