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Finding the Fourth Proportional to 1,291.12, 1,781.88 and 825.28

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Solution

The fourth proportional to 1,291.12, 1,781.88 and 825.28 is: 1,138.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.12 : 1,781.88 = 825.28 : x
  2. Step 2: Convert to fraction form
    1,291.12/1,781.88 = 825.28/x
  3. Step 3: Cross multiply
    1,291.12x = 1,781.88 × 825.28
  4. Step 4: Simplify right side
    1,291.12x = 1,470,549.93
  5. Step 5: Solve for x
    x = 1,470,549.93/1,291.12
  6. Step 6: Final answer
    x = 1,138.97

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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.