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Finding the Fourth Proportional to 831.20, 1,247.24 and 369.30

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Solution

The fourth proportional to 831.20, 1,247.24 and 369.30 is: 554.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.20 : 1,247.24 = 369.30 : x
  2. Step 2: Convert to fraction form
    831.20/1,247.24 = 369.30/x
  3. Step 3: Cross multiply
    831.20x = 1,247.24 × 369.30
  4. Step 4: Simplify right side
    831.20x = 460,605.73
  5. Step 5: Solve for x
    x = 460,605.73/831.20
  6. Step 6: Final answer
    x = 554.15

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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.