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Finding the Fourth Proportional to 865.12, 1,194.39 and 585.40

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Solution

The fourth proportional to 865.12, 1,194.39 and 585.40 is: 808.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.12 : 1,194.39 = 585.40 : x
  2. Step 2: Convert to fraction form
    865.12/1,194.39 = 585.40/x
  3. Step 3: Cross multiply
    865.12x = 1,194.39 × 585.40
  4. Step 4: Simplify right side
    865.12x = 699,195.91
  5. Step 5: Solve for x
    x = 699,195.91/865.12
  6. Step 6: Final answer
    x = 808.21

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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.