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Finding the Fourth Proportional to 2,168.63, 3,253.64 and 781.95

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Solution

The fourth proportional to 2,168.63, 3,253.64 and 781.95 is: 1,173.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,168.63 : 3,253.64 = 781.95 : x
  2. Step 2: Convert to fraction form
    2,168.63/3,253.64 = 781.95/x
  3. Step 3: Cross multiply
    2,168.63x = 3,253.64 × 781.95
  4. Step 4: Simplify right side
    2,168.63x = 2,544,179.89
  5. Step 5: Solve for x
    x = 2,544,179.89/2,168.63
  6. Step 6: Final answer
    x = 1,173.18

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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.