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Finding the Fourth Proportional to 217.90, 328.12 and 181.66

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Solution

The fourth proportional to 217.90, 328.12 and 181.66 is: 273.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.90 : 328.12 = 181.66 : x
  2. Step 2: Convert to fraction form
    217.90/328.12 = 181.66/x
  3. Step 3: Cross multiply
    217.90x = 328.12 × 181.66
  4. Step 4: Simplify right side
    217.90x = 59,606.28
  5. Step 5: Solve for x
    x = 59,606.28/217.90
  6. Step 6: Final answer
    x = 273.55

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.