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Finding the Fourth Proportional to 831.02, 1,246.20 and 420.41

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Solution

The fourth proportional to 831.02, 1,246.20 and 420.41 is: 630.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.02 : 1,246.20 = 420.41 : x
  2. Step 2: Convert to fraction form
    831.02/1,246.20 = 420.41/x
  3. Step 3: Cross multiply
    831.02x = 1,246.20 × 420.41
  4. Step 4: Simplify right side
    831.02x = 523,914.94
  5. Step 5: Solve for x
    x = 523,914.94/831.02
  6. Step 6: Final answer
    x = 630.45

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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.