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Finding the Fourth Proportional to 253.65, 349.30 and 225.71

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Solution

The fourth proportional to 253.65, 349.30 and 225.71 is: 310.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.65 : 349.30 = 225.71 : x
  2. Step 2: Convert to fraction form
    253.65/349.30 = 225.71/x
  3. Step 3: Cross multiply
    253.65x = 349.30 × 225.71
  4. Step 4: Simplify right side
    253.65x = 78,840.35
  5. Step 5: Solve for x
    x = 78,840.35/253.65
  6. Step 6: Final answer
    x = 310.82

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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.