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Finding the Fourth Proportional to 15,717.39, 21,689.39 and 8,643.39

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Solution

The fourth proportional to 15,717.39, 21,689.39 and 8,643.39 is: 11,927.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,717.39 : 21,689.39 = 8,643.39 : x
  2. Step 2: Convert to fraction form
    15,717.39/21,689.39 = 8,643.39/x
  3. Step 3: Cross multiply
    15,717.39x = 21,689.39 × 8,643.39
  4. Step 4: Simplify right side
    15,717.39x = 187,469,856.63
  5. Step 5: Solve for x
    x = 187,469,856.63/15,717.39
  6. Step 6: Final answer
    x = 11,927.54

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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.