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Finding the Fourth Proportional to 831.29, 1,245.71 and 344.68

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Solution

The fourth proportional to 831.29, 1,245.71 and 344.68 is: 516.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.29 : 1,245.71 = 344.68 : x
  2. Step 2: Convert to fraction form
    831.29/1,245.71 = 344.68/x
  3. Step 3: Cross multiply
    831.29x = 1,245.71 × 344.68
  4. Step 4: Simplify right side
    831.29x = 429,369.07
  5. Step 5: Solve for x
    x = 429,369.07/831.29
  6. Step 6: Final answer
    x = 516.51

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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.