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Finding the Fourth Proportional to 769.65, 1,062 and 438.06

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Solution

The fourth proportional to 769.65, 1,062 and 438.06 is: 604.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.65 : 1,062 = 438.06 : x
  2. Step 2: Convert to fraction form
    769.65/1,062 = 438.06/x
  3. Step 3: Cross multiply
    769.65x = 1,062 × 438.06
  4. Step 4: Simplify right side
    769.65x = 465,219.72
  5. Step 5: Solve for x
    x = 465,219.72/769.65
  6. Step 6: Final answer
    x = 604.46

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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.