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Finding the Fourth Proportional to 8,691.33, 11,990.93 and 5,287.17

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Solution

The fourth proportional to 8,691.33, 11,990.93 and 5,287.17 is: 7,294.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,691.33 : 11,990.93 = 5,287.17 : x
  2. Step 2: Convert to fraction form
    8,691.33/11,990.93 = 5,287.17/x
  3. Step 3: Cross multiply
    8,691.33x = 11,990.93 × 5,287.17
  4. Step 4: Simplify right side
    8,691.33x = 63,398,058.93
  5. Step 5: Solve for x
    x = 63,398,058.93/8,691.33
  6. Step 6: Final answer
    x = 7,294.40

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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.