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Finding the Fourth Proportional to 15,149.13, 20,905.79 and 8,862.72

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Solution

The fourth proportional to 15,149.13, 20,905.79 and 8,862.72 is: 12,230.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,149.13 : 20,905.79 = 8,862.72 : x
  2. Step 2: Convert to fraction form
    15,149.13/20,905.79 = 8,862.72/x
  3. Step 3: Cross multiply
    15,149.13x = 20,905.79 × 8,862.72
  4. Step 4: Simplify right side
    15,149.13x = 185,282,163.15
  5. Step 5: Solve for x
    x = 185,282,163.15/15,149.13
  6. Step 6: Final answer
    x = 12,230.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.