Home / 20,855.64-28,781.18-11,423.61

Finding the Fourth Proportional to 20,855.64, 28,781.18 and 11,423.61

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Solution

The fourth proportional to 20,855.64, 28,781.18 and 11,423.61 is: 15,764.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.64 : 28,781.18 = 11,423.61 : x
  2. Step 2: Convert to fraction form
    20,855.64/28,781.18 = 11,423.61/x
  3. Step 3: Cross multiply
    20,855.64x = 28,781.18 × 11,423.61
  4. Step 4: Simplify right side
    20,855.64x = 328,784,918.54
  5. Step 5: Solve for x
    x = 328,784,918.54/20,855.64
  6. Step 6: Final answer
    x = 15,764.80

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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.