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Finding the Fourth Proportional to 307.97, 424.98 and 225.42

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Solution

The fourth proportional to 307.97, 424.98 and 225.42 is: 311.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.97 : 424.98 = 225.42 : x
  2. Step 2: Convert to fraction form
    307.97/424.98 = 225.42/x
  3. Step 3: Cross multiply
    307.97x = 424.98 × 225.42
  4. Step 4: Simplify right side
    307.97x = 95,798.99
  5. Step 5: Solve for x
    x = 95,798.99/307.97
  6. Step 6: Final answer
    x = 311.07

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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.