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Finding the Fourth Proportional to 261.75, 360.86 and 217.33

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Solution

The fourth proportional to 261.75, 360.86 and 217.33 is: 299.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.75 : 360.86 = 217.33 : x
  2. Step 2: Convert to fraction form
    261.75/360.86 = 217.33/x
  3. Step 3: Cross multiply
    261.75x = 360.86 × 217.33
  4. Step 4: Simplify right side
    261.75x = 78,424.98
  5. Step 5: Solve for x
    x = 78,424.98/261.75
  6. Step 6: Final answer
    x = 299.62

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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.