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Finding the Fourth Proportional to 831.62, 1,247.39 and 215.33

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Solution

The fourth proportional to 831.62, 1,247.39 and 215.33 is: 322.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.62 : 1,247.39 = 215.33 : x
  2. Step 2: Convert to fraction form
    831.62/1,247.39 = 215.33/x
  3. Step 3: Cross multiply
    831.62x = 1,247.39 × 215.33
  4. Step 4: Simplify right side
    831.62x = 268,593.18
  5. Step 5: Solve for x
    x = 268,593.18/831.62
  6. Step 6: Final answer
    x = 322.97

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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.