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Finding the Fourth Proportional to 12,691.88, 17,512.36 and 8,215.01

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Solution

The fourth proportional to 12,691.88, 17,512.36 and 8,215.01 is: 11,335.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,691.88 : 17,512.36 = 8,215.01 : x
  2. Step 2: Convert to fraction form
    12,691.88/17,512.36 = 8,215.01/x
  3. Step 3: Cross multiply
    12,691.88x = 17,512.36 × 8,215.01
  4. Step 4: Simplify right side
    12,691.88x = 143,864,104.42
  5. Step 5: Solve for x
    x = 143,864,104.42/12,691.88
  6. Step 6: Final answer
    x = 11,335.13

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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.