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Finding the Fourth Proportional to 769.90, 1,062.36 and 438.31

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Solution

The fourth proportional to 769.90, 1,062.36 and 438.31 is: 604.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.90 : 1,062.36 = 438.31 : x
  2. Step 2: Convert to fraction form
    769.90/1,062.36 = 438.31/x
  3. Step 3: Cross multiply
    769.90x = 1,062.36 × 438.31
  4. Step 4: Simplify right side
    769.90x = 465,640.82
  5. Step 5: Solve for x
    x = 465,640.82/769.90
  6. Step 6: Final answer
    x = 604.81

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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.