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Finding the Fourth Proportional to 831.88, 1,247.94 and 345.04

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Solution

The fourth proportional to 831.88, 1,247.94 and 345.04 is: 517.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.88 : 1,247.94 = 345.04 : x
  2. Step 2: Convert to fraction form
    831.88/1,247.94 = 345.04/x
  3. Step 3: Cross multiply
    831.88x = 1,247.94 × 345.04
  4. Step 4: Simplify right side
    831.88x = 430,589.22
  5. Step 5: Solve for x
    x = 430,589.22/831.88
  6. Step 6: Final answer
    x = 517.61

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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.