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Finding the Fourth Proportional to 261.72, 360.09 and 226.63

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Solution

The fourth proportional to 261.72, 360.09 and 226.63 is: 311.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.72 : 360.09 = 226.63 : x
  2. Step 2: Convert to fraction form
    261.72/360.09 = 226.63/x
  3. Step 3: Cross multiply
    261.72x = 360.09 × 226.63
  4. Step 4: Simplify right side
    261.72x = 81,607.20
  5. Step 5: Solve for x
    x = 81,607.20/261.72
  6. Step 6: Final answer
    x = 311.81

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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.