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Finding the Fourth Proportional to 211.11, 291.45 and 144.81

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Solution

The fourth proportional to 211.11, 291.45 and 144.81 is: 199.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.11 : 291.45 = 144.81 : x
  2. Step 2: Convert to fraction form
    211.11/291.45 = 144.81/x
  3. Step 3: Cross multiply
    211.11x = 291.45 × 144.81
  4. Step 4: Simplify right side
    211.11x = 42,205.42
  5. Step 5: Solve for x
    x = 42,205.42/211.11
  6. Step 6: Final answer
    x = 199.93

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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.