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Finding the Fourth Proportional to 20,993.91, 28,972.91 and 11,562.47

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Solution

The fourth proportional to 20,993.91, 28,972.91 and 11,562.47 is: 15,956.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,993.91 : 28,972.91 = 11,562.47 : x
  2. Step 2: Convert to fraction form
    20,993.91/28,972.91 = 11,562.47/x
  3. Step 3: Cross multiply
    20,993.91x = 28,972.91 × 11,562.47
  4. Step 4: Simplify right side
    20,993.91x = 334,998,402.69
  5. Step 5: Solve for x
    x = 334,998,402.69/20,993.91
  6. Step 6: Final answer
    x = 15,956.93

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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.