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Finding the Fourth Proportional to 15,761.39, 21,750.48 and 8,687.66

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Solution

The fourth proportional to 15,761.39, 21,750.48 and 8,687.66 is: 11,988.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,761.39 : 21,750.48 = 8,687.66 : x
  2. Step 2: Convert to fraction form
    15,761.39/21,750.48 = 8,687.66/x
  3. Step 3: Cross multiply
    15,761.39x = 21,750.48 × 8,687.66
  4. Step 4: Simplify right side
    15,761.39x = 188,960,666.32
  5. Step 5: Solve for x
    x = 188,960,666.32/15,761.39
  6. Step 6: Final answer
    x = 11,988.84

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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.