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Finding the Fourth Proportional to 299.40, 412.74 and 225.72

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Solution

The fourth proportional to 299.40, 412.74 and 225.72 is: 311.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.40 : 412.74 = 225.72 : x
  2. Step 2: Convert to fraction form
    299.40/412.74 = 225.72/x
  3. Step 3: Cross multiply
    299.40x = 412.74 × 225.72
  4. Step 4: Simplify right side
    299.40x = 93,163.67
  5. Step 5: Solve for x
    x = 93,163.67/299.40
  6. Step 6: Final answer
    x = 311.17

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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.