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Finding the Fourth Proportional to 831.26, 1,245.90 and 368.94

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Solution

The fourth proportional to 831.26, 1,245.90 and 368.94 is: 552.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.26 : 1,245.90 = 368.94 : x
  2. Step 2: Convert to fraction form
    831.26/1,245.90 = 368.94/x
  3. Step 3: Cross multiply
    831.26x = 1,245.90 × 368.94
  4. Step 4: Simplify right side
    831.26x = 459,662.35
  5. Step 5: Solve for x
    x = 459,662.35/831.26
  6. Step 6: Final answer
    x = 552.97

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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.