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Finding the Fourth Proportional to 2,180.40, 3,008.40 and 1,296.42

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Solution

The fourth proportional to 2,180.40, 3,008.40 and 1,296.42 is: 1,788.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,180.40 : 3,008.40 = 1,296.42 : x
  2. Step 2: Convert to fraction form
    2,180.40/3,008.40 = 1,296.42/x
  3. Step 3: Cross multiply
    2,180.40x = 3,008.40 × 1,296.42
  4. Step 4: Simplify right side
    2,180.40x = 3,900,149.93
  5. Step 5: Solve for x
    x = 3,900,149.93/2,180.40
  6. Step 6: Final answer
    x = 1,788.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.