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Finding the Fourth Proportional to 261.11, 359.50 and 221.68

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Solution

The fourth proportional to 261.11, 359.50 and 221.68 is: 305.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.11 : 359.50 = 221.68 : x
  2. Step 2: Convert to fraction form
    261.11/359.50 = 221.68/x
  3. Step 3: Cross multiply
    261.11x = 359.50 × 221.68
  4. Step 4: Simplify right side
    261.11x = 79,691.05
  5. Step 5: Solve for x
    x = 79,691.05/261.11
  6. Step 6: Final answer
    x = 305.21

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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.