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Finding the Fourth Proportional to 849.65, 1,275.15 and 329.90

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Solution

The fourth proportional to 849.65, 1,275.15 and 329.90 is: 495.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.65 : 1,275.15 = 329.90 : x
  2. Step 2: Convert to fraction form
    849.65/1,275.15 = 329.90/x
  3. Step 3: Cross multiply
    849.65x = 1,275.15 × 329.90
  4. Step 4: Simplify right side
    849.65x = 420,665.61
  5. Step 5: Solve for x
    x = 420,665.61/849.65
  6. Step 6: Final answer
    x = 495.11

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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.