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Finding the Fourth Proportional to 8,691.32, 11,993.28 and 4,914.30

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Solution

The fourth proportional to 8,691.32, 11,993.28 and 4,914.30 is: 6,781.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,691.32 : 11,993.28 = 4,914.30 : x
  2. Step 2: Convert to fraction form
    8,691.32/11,993.28 = 4,914.30/x
  3. Step 3: Cross multiply
    8,691.32x = 11,993.28 × 4,914.30
  4. Step 4: Simplify right side
    8,691.32x = 58,938,575.90
  5. Step 5: Solve for x
    x = 58,938,575.90/8,691.32
  6. Step 6: Final answer
    x = 6,781.31

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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.