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Finding the Fourth Proportional to 20,956, 28,902 and 12,566.56

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Solution

The fourth proportional to 20,956, 28,902 and 12,566.56 is: 17,331.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,956 : 28,902 = 12,566.56 : x
  2. Step 2: Convert to fraction form
    20,956/28,902 = 12,566.56/x
  3. Step 3: Cross multiply
    20,956x = 28,902 × 12,566.56
  4. Step 4: Simplify right side
    20,956x = 363,198,717.12
  5. Step 5: Solve for x
    x = 363,198,717.12/20,956
  6. Step 6: Final answer
    x = 17,331.49

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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.