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Finding the Fourth Proportional to 865.11, 1,295.81 and 620.79

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Solution

The fourth proportional to 865.11, 1,295.81 and 620.79 is: 929.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.11 : 1,295.81 = 620.79 : x
  2. Step 2: Convert to fraction form
    865.11/1,295.81 = 620.79/x
  3. Step 3: Cross multiply
    865.11x = 1,295.81 × 620.79
  4. Step 4: Simplify right side
    865.11x = 804,422.79
  5. Step 5: Solve for x
    x = 804,422.79/865.11
  6. Step 6: Final answer
    x = 929.85

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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.