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Finding the Fourth Proportional to 18,999.87, 28,474.97 and 10,215.87

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Solution

The fourth proportional to 18,999.87, 28,474.97 and 10,215.87 is: 15,310.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,999.87 : 28,474.97 = 10,215.87 : x
  2. Step 2: Convert to fraction form
    18,999.87/28,474.97 = 10,215.87/x
  3. Step 3: Cross multiply
    18,999.87x = 28,474.97 × 10,215.87
  4. Step 4: Simplify right side
    18,999.87x = 290,896,540.69
  5. Step 5: Solve for x
    x = 290,896,540.69/18,999.87
  6. Step 6: Final answer
    x = 15,310.45

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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.