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Finding the Fourth Proportional to 15,761.31, 21,750.65 and 8,687.76

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Solution

The fourth proportional to 15,761.31, 21,750.65 and 8,687.76 is: 11,989.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,761.31 : 21,750.65 = 8,687.76 : x
  2. Step 2: Convert to fraction form
    15,761.31/21,750.65 = 8,687.76/x
  3. Step 3: Cross multiply
    15,761.31x = 21,750.65 × 8,687.76
  4. Step 4: Simplify right side
    15,761.31x = 188,964,427.04
  5. Step 5: Solve for x
    x = 188,964,427.04/15,761.31
  6. Step 6: Final answer
    x = 11,989.13

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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.