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Finding the Fourth Proportional to 211.32, 316.66 and 189.66

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Solution

The fourth proportional to 211.32, 316.66 and 189.66 is: 284.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.32 : 316.66 = 189.66 : x
  2. Step 2: Convert to fraction form
    211.32/316.66 = 189.66/x
  3. Step 3: Cross multiply
    211.32x = 316.66 × 189.66
  4. Step 4: Simplify right side
    211.32x = 60,057.74
  5. Step 5: Solve for x
    x = 60,057.74/211.32
  6. Step 6: Final answer
    x = 284.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.