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Finding the Fourth Proportional to 694.74, 1,040.76 and 420.96

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Solution

The fourth proportional to 694.74, 1,040.76 and 420.96 is: 630.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.74 : 1,040.76 = 420.96 : x
  2. Step 2: Convert to fraction form
    694.74/1,040.76 = 420.96/x
  3. Step 3: Cross multiply
    694.74x = 1,040.76 × 420.96
  4. Step 4: Simplify right side
    694.74x = 438,118.33
  5. Step 5: Solve for x
    x = 438,118.33/694.74
  6. Step 6: Final answer
    x = 630.62

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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.