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Finding the Fourth Proportional to 3,909.13, 5,863.74 and 987.44

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Solution

The fourth proportional to 3,909.13, 5,863.74 and 987.44 is: 1,481.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,909.13 : 5,863.74 = 987.44 : x
  2. Step 2: Convert to fraction form
    3,909.13/5,863.74 = 987.44/x
  3. Step 3: Cross multiply
    3,909.13x = 5,863.74 × 987.44
  4. Step 4: Simplify right side
    3,909.13x = 5,790,057.17
  5. Step 5: Solve for x
    x = 5,790,057.17/3,909.13
  6. Step 6: Final answer
    x = 1,481.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.