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Finding the Fourth Proportional to 15,761.84, 21,751.38 and 8,688.11

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Solution

The fourth proportional to 15,761.84, 21,751.38 and 8,688.11 is: 11,989.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,761.84 : 21,751.38 = 8,688.11 : x
  2. Step 2: Convert to fraction form
    15,761.84/21,751.38 = 8,688.11/x
  3. Step 3: Cross multiply
    15,761.84x = 21,751.38 × 8,688.11
  4. Step 4: Simplify right side
    15,761.84x = 188,978,273.33
  5. Step 5: Solve for x
    x = 188,978,273.33/15,761.84
  6. Step 6: Final answer
    x = 11,989.61

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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.