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Finding the Fourth Proportional to 20,642.61, 28,498.61 and 13,589.54

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Solution

The fourth proportional to 20,642.61, 28,498.61 and 13,589.54 is: 18,761.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,642.61 : 28,498.61 = 13,589.54 : x
  2. Step 2: Convert to fraction form
    20,642.61/28,498.61 = 13,589.54/x
  3. Step 3: Cross multiply
    20,642.61x = 28,498.61 × 13,589.54
  4. Step 4: Simplify right side
    20,642.61x = 387,282,790.10
  5. Step 5: Solve for x
    x = 387,282,790.10/20,642.61
  6. Step 6: Final answer
    x = 18,761.33

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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.