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Finding the Fourth Proportional to 831.68, 1,247.17 and 441.60

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Solution

The fourth proportional to 831.68, 1,247.17 and 441.60 is: 662.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.68 : 1,247.17 = 441.60 : x
  2. Step 2: Convert to fraction form
    831.68/1,247.17 = 441.60/x
  3. Step 3: Cross multiply
    831.68x = 1,247.17 × 441.60
  4. Step 4: Simplify right side
    831.68x = 550,748.06
  5. Step 5: Solve for x
    x = 550,748.06/831.68
  6. Step 6: Final answer
    x = 662.21

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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.