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Finding the Fourth Proportional to 28,140, 38,833.20 and 18,204

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Solution

The fourth proportional to 28,140, 38,833.20 and 18,204 is: 25,121.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,140 : 38,833.20 = 18,204 : x
  2. Step 2: Convert to fraction form
    28,140/38,833.20 = 18,204/x
  3. Step 3: Cross multiply
    28,140x = 38,833.20 × 18,204
  4. Step 4: Simplify right side
    28,140x = 706,919,572.80
  5. Step 5: Solve for x
    x = 706,919,572.80/28,140
  6. Step 6: Final answer
    x = 25,121.52

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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.