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Finding the Fourth Proportional to 2,512.64, 3,768.92 and 781.28

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Solution

The fourth proportional to 2,512.64, 3,768.92 and 781.28 is: 1,171.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,512.64 : 3,768.92 = 781.28 : x
  2. Step 2: Convert to fraction form
    2,512.64/3,768.92 = 781.28/x
  3. Step 3: Cross multiply
    2,512.64x = 3,768.92 × 781.28
  4. Step 4: Simplify right side
    2,512.64x = 2,944,581.82
  5. Step 5: Solve for x
    x = 2,944,581.82/2,512.64
  6. Step 6: Final answer
    x = 1,171.91

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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.