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Finding the Fourth Proportional to 831.86, 1,247.35 and 369.78

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Solution

The fourth proportional to 831.86, 1,247.35 and 369.78 is: 554.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.86 : 1,247.35 = 369.78 : x
  2. Step 2: Convert to fraction form
    831.86/1,247.35 = 369.78/x
  3. Step 3: Cross multiply
    831.86x = 1,247.35 × 369.78
  4. Step 4: Simplify right side
    831.86x = 461,245.08
  5. Step 5: Solve for x
    x = 461,245.08/831.86
  6. Step 6: Final answer
    x = 554.47

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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.