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Finding the Fourth Proportional to 225.25, 310.85 and 137.98

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Solution

The fourth proportional to 225.25, 310.85 and 137.98 is: 190.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.25 : 310.85 = 137.98 : x
  2. Step 2: Convert to fraction form
    225.25/310.85 = 137.98/x
  3. Step 3: Cross multiply
    225.25x = 310.85 × 137.98
  4. Step 4: Simplify right side
    225.25x = 42,891.08
  5. Step 5: Solve for x
    x = 42,891.08/225.25
  6. Step 6: Final answer
    x = 190.42

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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.