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Finding the Fourth Proportional to 22,759.76, 31,406.87 and 12,687.76

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Solution

The fourth proportional to 22,759.76, 31,406.87 and 12,687.76 is: 17,508.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,759.76 : 31,406.87 = 12,687.76 : x
  2. Step 2: Convert to fraction form
    22,759.76/31,406.87 = 12,687.76/x
  3. Step 3: Cross multiply
    22,759.76x = 31,406.87 × 12,687.76
  4. Step 4: Simplify right side
    22,759.76x = 398,482,608.44
  5. Step 5: Solve for x
    x = 398,482,608.44/22,759.76
  6. Step 6: Final answer
    x = 17,508.21

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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.