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Finding the Fourth Proportional to 831.84, 1,247.25 and 344.28

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Solution

The fourth proportional to 831.84, 1,247.25 and 344.28 is: 516.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.84 : 1,247.25 = 344.28 : x
  2. Step 2: Convert to fraction form
    831.84/1,247.25 = 344.28/x
  3. Step 3: Cross multiply
    831.84x = 1,247.25 × 344.28
  4. Step 4: Simplify right side
    831.84x = 429,403.23
  5. Step 5: Solve for x
    x = 429,403.23/831.84
  6. Step 6: Final answer
    x = 516.21

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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.