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Finding the Fourth Proportional to 211.45, 291.79 and 118.19

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Solution

The fourth proportional to 211.45, 291.79 and 118.19 is: 163.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.45 : 291.79 = 118.19 : x
  2. Step 2: Convert to fraction form
    211.45/291.79 = 118.19/x
  3. Step 3: Cross multiply
    211.45x = 291.79 × 118.19
  4. Step 4: Simplify right side
    211.45x = 34,487.50
  5. Step 5: Solve for x
    x = 34,487.50/211.45
  6. Step 6: Final answer
    x = 163.10

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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.