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Finding the Fourth Proportional to 18,815.20, 28,220.18 and 13,175.78

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Solution

The fourth proportional to 18,815.20, 28,220.18 and 13,175.78 is: 19,761.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,815.20 : 28,220.18 = 13,175.78 : x
  2. Step 2: Convert to fraction form
    18,815.20/28,220.18 = 13,175.78/x
  3. Step 3: Cross multiply
    18,815.20x = 28,220.18 × 13,175.78
  4. Step 4: Simplify right side
    18,815.20x = 371,822,883.24
  5. Step 5: Solve for x
    x = 371,822,883.24/18,815.20
  6. Step 6: Final answer
    x = 19,761.84

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1.5x scale

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.