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Finding the Fourth Proportional to 831.06, 1,246.62 and 419.70

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Solution

The fourth proportional to 831.06, 1,246.62 and 419.70 is: 629.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.06 : 1,246.62 = 419.70 : x
  2. Step 2: Convert to fraction form
    831.06/1,246.62 = 419.70/x
  3. Step 3: Cross multiply
    831.06x = 1,246.62 × 419.70
  4. Step 4: Simplify right side
    831.06x = 523,206.41
  5. Step 5: Solve for x
    x = 523,206.41/831.06
  6. Step 6: Final answer
    x = 629.57

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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.