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Finding the Fourth Proportional to 2,168.81, 3,251.26 and 781.17

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Solution

The fourth proportional to 2,168.81, 3,251.26 and 781.17 is: 1,171.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,168.81 : 3,251.26 = 781.17 : x
  2. Step 2: Convert to fraction form
    2,168.81/3,251.26 = 781.17/x
  3. Step 3: Cross multiply
    2,168.81x = 3,251.26 × 781.17
  4. Step 4: Simplify right side
    2,168.81x = 2,539,786.77
  5. Step 5: Solve for x
    x = 2,539,786.77/2,168.81
  6. Step 6: Final answer
    x = 1,171.05

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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.