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Finding the Fourth Proportional to 225.31, 310.82 and 151.65

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Solution

The fourth proportional to 225.31, 310.82 and 151.65 is: 209.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.31 : 310.82 = 151.65 : x
  2. Step 2: Convert to fraction form
    225.31/310.82 = 151.65/x
  3. Step 3: Cross multiply
    225.31x = 310.82 × 151.65
  4. Step 4: Simplify right side
    225.31x = 47,134.30
  5. Step 5: Solve for x
    x = 47,134.30/225.31
  6. Step 6: Final answer
    x = 209.20

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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.