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Finding the Fourth Proportional to 28,255.72, 38,978.17 and 16,763.95

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Solution

The fourth proportional to 28,255.72, 38,978.17 and 16,763.95 is: 23,125.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,255.72 : 38,978.17 = 16,763.95 : x
  2. Step 2: Convert to fraction form
    28,255.72/38,978.17 = 16,763.95/x
  3. Step 3: Cross multiply
    28,255.72x = 38,978.17 × 16,763.95
  4. Step 4: Simplify right side
    28,255.72x = 653,428,092.97
  5. Step 5: Solve for x
    x = 653,428,092.97/28,255.72
  6. Step 6: Final answer
    x = 23,125.52

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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.