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Finding the Fourth Proportional to 20,791, 28,691.58 and 11,359.63

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Solution

The fourth proportional to 20,791, 28,691.58 and 11,359.63 is: 15,676.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,791 : 28,691.58 = 11,359.63 : x
  2. Step 2: Convert to fraction form
    20,791/28,691.58 = 11,359.63/x
  3. Step 3: Cross multiply
    20,791x = 28,691.58 × 11,359.63
  4. Step 4: Simplify right side
    20,791x = 325,925,732.92
  5. Step 5: Solve for x
    x = 325,925,732.92/20,791
  6. Step 6: Final answer
    x = 15,676.29

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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.