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Finding the Fourth Proportional to 694.47, 1,040.79 and 620.91

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Solution

The fourth proportional to 694.47, 1,040.79 and 620.91 is: 930.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.47 : 1,040.79 = 620.91 : x
  2. Step 2: Convert to fraction form
    694.47/1,040.79 = 620.91/x
  3. Step 3: Cross multiply
    694.47x = 1,040.79 × 620.91
  4. Step 4: Simplify right side
    694.47x = 646,236.92
  5. Step 5: Solve for x
    x = 646,236.92/694.47
  6. Step 6: Final answer
    x = 930.55

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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.