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Finding the Fourth Proportional to 2,781.36, 4,171.86 and 932.64

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Solution

The fourth proportional to 2,781.36, 4,171.86 and 932.64 is: 1,398.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,781.36 : 4,171.86 = 932.64 : x
  2. Step 2: Convert to fraction form
    2,781.36/4,171.86 = 932.64/x
  3. Step 3: Cross multiply
    2,781.36x = 4,171.86 × 932.64
  4. Step 4: Simplify right side
    2,781.36x = 3,890,843.51
  5. Step 5: Solve for x
    x = 3,890,843.51/2,781.36
  6. Step 6: Final answer
    x = 1,398.90

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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.