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Finding the Fourth Proportional to 18,772.80, 28,159.20 and 18,481.20

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Solution

The fourth proportional to 18,772.80, 28,159.20 and 18,481.20 is: 27,721.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,772.80 : 28,159.20 = 18,481.20 : x
  2. Step 2: Convert to fraction form
    18,772.80/28,159.20 = 18,481.20/x
  3. Step 3: Cross multiply
    18,772.80x = 28,159.20 × 18,481.20
  4. Step 4: Simplify right side
    18,772.80x = 520,415,807.04
  5. Step 5: Solve for x
    x = 520,415,807.04/18,772.80
  6. Step 6: Final answer
    x = 27,721.80

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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.