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Finding the Fourth Proportional to 2,612.56, 3,918.78 and 881.20

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Solution

The fourth proportional to 2,612.56, 3,918.78 and 881.20 is: 1,321.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,612.56 : 3,918.78 = 881.20 : x
  2. Step 2: Convert to fraction form
    2,612.56/3,918.78 = 881.20/x
  3. Step 3: Cross multiply
    2,612.56x = 3,918.78 × 881.20
  4. Step 4: Simplify right side
    2,612.56x = 3,453,228.94
  5. Step 5: Solve for x
    x = 3,453,228.94/2,612.56
  6. Step 6: Final answer
    x = 1,321.78

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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.