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Finding the Fourth Proportional to 1,223.92, 1,689.48 and 831.12

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Solution

The fourth proportional to 1,223.92, 1,689.48 and 831.12 is: 1,147.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.92 : 1,689.48 = 831.12 : x
  2. Step 2: Convert to fraction form
    1,223.92/1,689.48 = 831.12/x
  3. Step 3: Cross multiply
    1,223.92x = 1,689.48 × 831.12
  4. Step 4: Simplify right side
    1,223.92x = 1,404,160.62
  5. Step 5: Solve for x
    x = 1,404,160.62/1,223.92
  6. Step 6: Final answer
    x = 1,147.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.