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Finding the Fourth Proportional to 2,135.74, 3,201.65 and 748.31

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Solution

The fourth proportional to 2,135.74, 3,201.65 and 748.31 is: 1,121.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,135.74 : 3,201.65 = 748.31 : x
  2. Step 2: Convert to fraction form
    2,135.74/3,201.65 = 748.31/x
  3. Step 3: Cross multiply
    2,135.74x = 3,201.65 × 748.31
  4. Step 4: Simplify right side
    2,135.74x = 2,395,826.71
  5. Step 5: Solve for x
    x = 2,395,826.71/2,135.74
  6. Step 6: Final answer
    x = 1,121.78

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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.