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Finding the Fourth Proportional to 2,939.76, 4,410.42 and 991.68

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Solution

The fourth proportional to 2,939.76, 4,410.42 and 991.68 is: 1,487.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,939.76 : 4,410.42 = 991.68 : x
  2. Step 2: Convert to fraction form
    2,939.76/4,410.42 = 991.68/x
  3. Step 3: Cross multiply
    2,939.76x = 4,410.42 × 991.68
  4. Step 4: Simplify right side
    2,939.76x = 4,373,725.31
  5. Step 5: Solve for x
    x = 4,373,725.31/2,939.76
  6. Step 6: Final answer
    x = 1,487.78

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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.