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Finding the Fourth Proportional to 307.98, 425.21 and 225.29

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Solution

The fourth proportional to 307.98, 425.21 and 225.29 is: 311.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.98 : 425.21 = 225.29 : x
  2. Step 2: Convert to fraction form
    307.98/425.21 = 225.29/x
  3. Step 3: Cross multiply
    307.98x = 425.21 × 225.29
  4. Step 4: Simplify right side
    307.98x = 95,792.31
  5. Step 5: Solve for x
    x = 95,792.31/307.98
  6. Step 6: Final answer
    x = 311.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.