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Finding the Fourth Proportional to 831.98, 1,247.78 and 345.18

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Solution

The fourth proportional to 831.98, 1,247.78 and 345.18 is: 517.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.98 : 1,247.78 = 345.18 : x
  2. Step 2: Convert to fraction form
    831.98/1,247.78 = 345.18/x
  3. Step 3: Cross multiply
    831.98x = 1,247.78 × 345.18
  4. Step 4: Simplify right side
    831.98x = 430,708.70
  5. Step 5: Solve for x
    x = 430,708.70/831.98
  6. Step 6: Final answer
    x = 517.69

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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.