Home / 15,715.40-21,687.41-8,641.88

Finding the Fourth Proportional to 15,715.40, 21,687.41 and 8,641.88

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Solution

The fourth proportional to 15,715.40, 21,687.41 and 8,641.88 is: 11,925.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,715.40 : 21,687.41 = 8,641.88 : x
  2. Step 2: Convert to fraction form
    15,715.40/21,687.41 = 8,641.88/x
  3. Step 3: Cross multiply
    15,715.40x = 21,687.41 × 8,641.88
  4. Step 4: Simplify right side
    15,715.40x = 187,419,907.90
  5. Step 5: Solve for x
    x = 187,419,907.90/15,715.40
  6. Step 6: Final answer
    x = 11,925.87

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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.