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Finding the Fourth Proportional to 18,772.80, 28,121.40 and 11,731.20

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Solution

The fourth proportional to 18,772.80, 28,121.40 and 11,731.20 is: 17,573.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,772.80 : 28,121.40 = 11,731.20 : x
  2. Step 2: Convert to fraction form
    18,772.80/28,121.40 = 11,731.20/x
  3. Step 3: Cross multiply
    18,772.80x = 28,121.40 × 11,731.20
  4. Step 4: Simplify right side
    18,772.80x = 329,897,767.68
  5. Step 5: Solve for x
    x = 329,897,767.68/18,772.80
  6. Step 6: Final answer
    x = 17,573.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.