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Finding the Fourth Proportional to 768.43, 1,150.81 and 421.25

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Solution

The fourth proportional to 768.43, 1,150.81 and 421.25 is: 630.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.43 : 1,150.81 = 421.25 : x
  2. Step 2: Convert to fraction form
    768.43/1,150.81 = 421.25/x
  3. Step 3: Cross multiply
    768.43x = 1,150.81 × 421.25
  4. Step 4: Simplify right side
    768.43x = 484,778.71
  5. Step 5: Solve for x
    x = 484,778.71/768.43
  6. Step 6: Final answer
    x = 630.87

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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.