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Finding the Fourth Proportional to 684.26, 1,025.31 and 391.22

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Solution

The fourth proportional to 684.26, 1,025.31 and 391.22 is: 586.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.26 : 1,025.31 = 391.22 : x
  2. Step 2: Convert to fraction form
    684.26/1,025.31 = 391.22/x
  3. Step 3: Cross multiply
    684.26x = 1,025.31 × 391.22
  4. Step 4: Simplify right side
    684.26x = 401,121.78
  5. Step 5: Solve for x
    x = 401,121.78/684.26
  6. Step 6: Final answer
    x = 586.21

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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.