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Finding the Fourth Proportional to 831.39, 1,244.91 and 538.44

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Solution

The fourth proportional to 831.39, 1,244.91 and 538.44 is: 806.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.39 : 1,244.91 = 538.44 : x
  2. Step 2: Convert to fraction form
    831.39/1,244.91 = 538.44/x
  3. Step 3: Cross multiply
    831.39x = 1,244.91 × 538.44
  4. Step 4: Simplify right side
    831.39x = 670,309.34
  5. Step 5: Solve for x
    x = 670,309.34/831.39
  6. Step 6: Final answer
    x = 806.25

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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.