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Finding the Fourth Proportional to 261.08, 359.46 and 221.66

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Solution

The fourth proportional to 261.08, 359.46 and 221.66 is: 305.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.08 : 359.46 = 221.66 : x
  2. Step 2: Convert to fraction form
    261.08/359.46 = 221.66/x
  3. Step 3: Cross multiply
    261.08x = 359.46 × 221.66
  4. Step 4: Simplify right side
    261.08x = 79,676.11
  5. Step 5: Solve for x
    x = 79,676.11/261.08
  6. Step 6: Final answer
    x = 305.18

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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.