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Finding the Fourth Proportional to 831.91, 1,247.55 and 276.52

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Solution

The fourth proportional to 831.91, 1,247.55 and 276.52 is: 414.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.91 : 1,247.55 = 276.52 : x
  2. Step 2: Convert to fraction form
    831.91/1,247.55 = 276.52/x
  3. Step 3: Cross multiply
    831.91x = 1,247.55 × 276.52
  4. Step 4: Simplify right side
    831.91x = 344,972.53
  5. Step 5: Solve for x
    x = 344,972.53/831.91
  6. Step 6: Final answer
    x = 414.68

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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.