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Finding the Fourth Proportional to 1,319.25, 1,974.76 and 831.27

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Solution

The fourth proportional to 1,319.25, 1,974.76 and 831.27 is: 1,244.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.25 : 1,974.76 = 831.27 : x
  2. Step 2: Convert to fraction form
    1,319.25/1,974.76 = 831.27/x
  3. Step 3: Cross multiply
    1,319.25x = 1,974.76 × 831.27
  4. Step 4: Simplify right side
    1,319.25x = 1,641,558.75
  5. Step 5: Solve for x
    x = 1,641,558.75/1,319.25
  6. Step 6: Final answer
    x = 1,244.31

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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.