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Finding the Fourth Proportional to 251.79, 345.90 and 225.90

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Solution

The fourth proportional to 251.79, 345.90 and 225.90 is: 310.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.79 : 345.90 = 225.90 : x
  2. Step 2: Convert to fraction form
    251.79/345.90 = 225.90/x
  3. Step 3: Cross multiply
    251.79x = 345.90 × 225.90
  4. Step 4: Simplify right side
    251.79x = 78,138.81
  5. Step 5: Solve for x
    x = 78,138.81/251.79
  6. Step 6: Final answer
    x = 310.33

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.