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Finding the Fourth Proportional to 865.04, 1,195.28 and 680

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Solution

The fourth proportional to 865.04, 1,195.28 and 680 is: 939.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.04 : 1,195.28 = 680 : x
  2. Step 2: Convert to fraction form
    865.04/1,195.28 = 680/x
  3. Step 3: Cross multiply
    865.04x = 1,195.28 × 680
  4. Step 4: Simplify right side
    865.04x = 812,790.40
  5. Step 5: Solve for x
    x = 812,790.40/865.04
  6. Step 6: Final answer
    x = 939.60

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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.