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Finding the Fourth Proportional to 831.66, 1,247.63 and 311.84

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Solution

The fourth proportional to 831.66, 1,247.63 and 311.84 is: 467.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.66 : 1,247.63 = 311.84 : x
  2. Step 2: Convert to fraction form
    831.66/1,247.63 = 311.84/x
  3. Step 3: Cross multiply
    831.66x = 1,247.63 × 311.84
  4. Step 4: Simplify right side
    831.66x = 389,060.94
  5. Step 5: Solve for x
    x = 389,060.94/831.66
  6. Step 6: Final answer
    x = 467.81

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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.