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Finding the Fourth Proportional to 15,761.28, 21,750.71 and 8,687.95

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Solution

The fourth proportional to 15,761.28, 21,750.71 and 8,687.95 is: 11,989.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,761.28 : 21,750.71 = 8,687.95 : x
  2. Step 2: Convert to fraction form
    15,761.28/21,750.71 = 8,687.95/x
  3. Step 3: Cross multiply
    15,761.28x = 21,750.71 × 8,687.95
  4. Step 4: Simplify right side
    15,761.28x = 188,969,135.32
  5. Step 5: Solve for x
    x = 188,969,135.32/15,761.28
  6. Step 6: Final answer
    x = 11,989.46

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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.