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Finding the Fourth Proportional to 211.82, 316.03 and 189.80

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Solution

The fourth proportional to 211.82, 316.03 and 189.80 is: 283.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.82 : 316.03 = 189.80 : x
  2. Step 2: Convert to fraction form
    211.82/316.03 = 189.80/x
  3. Step 3: Cross multiply
    211.82x = 316.03 × 189.80
  4. Step 4: Simplify right side
    211.82x = 59,979.96
  5. Step 5: Solve for x
    x = 59,979.96/211.82
  6. Step 6: Final answer
    x = 283.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.