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Finding the Fourth Proportional to 831.62, 1,249.86 and 771.28

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Solution

The fourth proportional to 831.62, 1,249.86 and 771.28 is: 1,159.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.62 : 1,249.86 = 771.28 : x
  2. Step 2: Convert to fraction form
    831.62/1,249.86 = 771.28/x
  3. Step 3: Cross multiply
    831.62x = 1,249.86 × 771.28
  4. Step 4: Simplify right side
    831.62x = 963,992.02
  5. Step 5: Solve for x
    x = 963,992.02/831.62
  6. Step 6: Final answer
    x = 1,159.17

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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.