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Finding the Fourth Proportional to 18,139.24, 25,023.90 and 12,164.68

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Solution

The fourth proportional to 18,139.24, 25,023.90 and 12,164.68 is: 16,781.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,139.24 : 25,023.90 = 12,164.68 : x
  2. Step 2: Convert to fraction form
    18,139.24/25,023.90 = 12,164.68/x
  3. Step 3: Cross multiply
    18,139.24x = 25,023.90 × 12,164.68
  4. Step 4: Simplify right side
    18,139.24x = 304,407,735.85
  5. Step 5: Solve for x
    x = 304,407,735.85/18,139.24
  6. Step 6: Final answer
    x = 16,781.72

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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.