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Finding the Fourth Proportional to 2,659.70, 3,989.64 and 881.12

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Solution

The fourth proportional to 2,659.70, 3,989.64 and 881.12 is: 1,321.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,659.70 : 3,989.64 = 881.12 : x
  2. Step 2: Convert to fraction form
    2,659.70/3,989.64 = 881.12/x
  3. Step 3: Cross multiply
    2,659.70x = 3,989.64 × 881.12
  4. Step 4: Simplify right side
    2,659.70x = 3,515,351.60
  5. Step 5: Solve for x
    x = 3,515,351.60/2,659.70
  6. Step 6: Final answer
    x = 1,321.71

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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.