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Finding the Fourth Proportional to 28,615.78, 42,876.15 and 20,254.42

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Solution

The fourth proportional to 28,615.78, 42,876.15 and 20,254.42 is: 30,348.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,615.78 : 42,876.15 = 20,254.42 : x
  2. Step 2: Convert to fraction form
    28,615.78/42,876.15 = 20,254.42/x
  3. Step 3: Cross multiply
    28,615.78x = 42,876.15 × 20,254.42
  4. Step 4: Simplify right side
    28,615.78x = 868,431,550.08
  5. Step 5: Solve for x
    x = 868,431,550.08/28,615.78
  6. Step 6: Final answer
    x = 30,348.00

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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.