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Finding the Fourth Proportional to 941.31, 1,408.68 and 831.15

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Solution

The fourth proportional to 941.31, 1,408.68 and 831.15 is: 1,243.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    941.31 : 1,408.68 = 831.15 : x
  2. Step 2: Convert to fraction form
    941.31/1,408.68 = 831.15/x
  3. Step 3: Cross multiply
    941.31x = 1,408.68 × 831.15
  4. Step 4: Simplify right side
    941.31x = 1,170,824.38
  5. Step 5: Solve for x
    x = 1,170,824.38/941.31
  6. Step 6: Final answer
    x = 1,243.82

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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.