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Finding the Fourth Proportional to 18,721.33, 28,086.85 and 9,360.97

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Solution

The fourth proportional to 18,721.33, 28,086.85 and 9,360.97 is: 14,043.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.33 : 28,086.85 = 9,360.97 : x
  2. Step 2: Convert to fraction form
    18,721.33/28,086.85 = 9,360.97/x
  3. Step 3: Cross multiply
    18,721.33x = 28,086.85 × 9,360.97
  4. Step 4: Simplify right side
    18,721.33x = 262,920,101.73
  5. Step 5: Solve for x
    x = 262,920,101.73/18,721.33
  6. Step 6: Final answer
    x = 14,043.88

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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.