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Finding the Fourth Proportional to 28,190.80, 42,259.80 and 10,672.40

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Solution

The fourth proportional to 28,190.80, 42,259.80 and 10,672.40 is: 15,998.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,190.80 : 42,259.80 = 10,672.40 : x
  2. Step 2: Convert to fraction form
    28,190.80/42,259.80 = 10,672.40/x
  3. Step 3: Cross multiply
    28,190.80x = 42,259.80 × 10,672.40
  4. Step 4: Simplify right side
    28,190.80x = 451,013,489.52
  5. Step 5: Solve for x
    x = 451,013,489.52/28,190.80
  6. Step 6: Final answer
    x = 15,998.61

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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.