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Finding the Fourth Proportional to 18,278.80, 27,418.20 and 13,904.80

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Solution

The fourth proportional to 18,278.80, 27,418.20 and 13,904.80 is: 20,857.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,278.80 : 27,418.20 = 13,904.80 : x
  2. Step 2: Convert to fraction form
    18,278.80/27,418.20 = 13,904.80/x
  3. Step 3: Cross multiply
    18,278.80x = 27,418.20 × 13,904.80
  4. Step 4: Simplify right side
    18,278.80x = 381,244,587.36
  5. Step 5: Solve for x
    x = 381,244,587.36/18,278.80
  6. Step 6: Final answer
    x = 20,857.20

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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.