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Finding the Fourth Proportional to 211.39, 291.69 and 118.13

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Solution

The fourth proportional to 211.39, 291.69 and 118.13 is: 163.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.39 : 291.69 = 118.13 : x
  2. Step 2: Convert to fraction form
    211.39/291.69 = 118.13/x
  3. Step 3: Cross multiply
    211.39x = 291.69 × 118.13
  4. Step 4: Simplify right side
    211.39x = 34,457.42
  5. Step 5: Solve for x
    x = 34,457.42/211.39
  6. Step 6: Final answer
    x = 163.01

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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.