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Finding the Fourth Proportional to 15,717.15, 21,687.89 and 8,643.15

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Solution

The fourth proportional to 15,717.15, 21,687.89 and 8,643.15 is: 11,926.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,717.15 : 21,687.89 = 8,643.15 : x
  2. Step 2: Convert to fraction form
    15,717.15/21,687.89 = 8,643.15/x
  3. Step 3: Cross multiply
    15,717.15x = 21,687.89 × 8,643.15
  4. Step 4: Simplify right side
    15,717.15x = 187,451,643.24
  5. Step 5: Solve for x
    x = 187,451,643.24/15,717.15
  6. Step 6: Final answer
    x = 11,926.57

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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.