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Finding the Fourth Proportional to 831.07, 1,246.68 and 419.95

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Solution

The fourth proportional to 831.07, 1,246.68 and 419.95 is: 629.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.07 : 1,246.68 = 419.95 : x
  2. Step 2: Convert to fraction form
    831.07/1,246.68 = 419.95/x
  3. Step 3: Cross multiply
    831.07x = 1,246.68 × 419.95
  4. Step 4: Simplify right side
    831.07x = 523,544.82
  5. Step 5: Solve for x
    x = 523,544.82/831.07
  6. Step 6: Final answer
    x = 629.96

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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.