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Finding the Fourth Proportional to 831.54, 1,247.91 and 679.26

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Solution

The fourth proportional to 831.54, 1,247.91 and 679.26 is: 1,019.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.54 : 1,247.91 = 679.26 : x
  2. Step 2: Convert to fraction form
    831.54/1,247.91 = 679.26/x
  3. Step 3: Cross multiply
    831.54x = 1,247.91 × 679.26
  4. Step 4: Simplify right side
    831.54x = 847,655.35
  5. Step 5: Solve for x
    x = 847,655.35/831.54
  6. Step 6: Final answer
    x = 1,019.38

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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.