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Finding the Fourth Proportional to 28,375.80, 42,489.30 and 20,010.48

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Solution

The fourth proportional to 28,375.80, 42,489.30 and 20,010.48 is: 29,963.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,375.80 : 42,489.30 = 20,010.48 : x
  2. Step 2: Convert to fraction form
    28,375.80/42,489.30 = 20,010.48/x
  3. Step 3: Cross multiply
    28,375.80x = 42,489.30 × 20,010.48
  4. Step 4: Simplify right side
    28,375.80x = 850,231,287.86
  5. Step 5: Solve for x
    x = 850,231,287.86/28,375.80
  6. Step 6: Final answer
    x = 29,963.25

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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.