Home / 15,715.32-21,687.72-8,642.40

Finding the Fourth Proportional to 15,715.32, 21,687.72 and 8,642.40

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Solution

The fourth proportional to 15,715.32, 21,687.72 and 8,642.40 is: 11,926.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,715.32 : 21,687.72 = 8,642.40 : x
  2. Step 2: Convert to fraction form
    15,715.32/21,687.72 = 8,642.40/x
  3. Step 3: Cross multiply
    15,715.32x = 21,687.72 × 8,642.40
  4. Step 4: Simplify right side
    15,715.32x = 187,433,951.33
  5. Step 5: Solve for x
    x = 187,433,951.33/15,715.32
  6. Step 6: Final answer
    x = 11,926.83

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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.