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Finding the Fourth Proportional to 20,902.72, 28,843.20 and 15,304

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Solution

The fourth proportional to 20,902.72, 28,843.20 and 15,304 is: 21,117.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,902.72 : 28,843.20 = 15,304 : x
  2. Step 2: Convert to fraction form
    20,902.72/28,843.20 = 15,304/x
  3. Step 3: Cross multiply
    20,902.72x = 28,843.20 × 15,304
  4. Step 4: Simplify right side
    20,902.72x = 441,416,332.80
  5. Step 5: Solve for x
    x = 441,416,332.80/20,902.72
  6. Step 6: Final answer
    x = 21,117.65

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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.