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Finding the Fourth Proportional to 211.61, 291.83 and 170.15

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Solution

The fourth proportional to 211.61, 291.83 and 170.15 is: 234.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.61 : 291.83 = 170.15 : x
  2. Step 2: Convert to fraction form
    211.61/291.83 = 170.15/x
  3. Step 3: Cross multiply
    211.61x = 291.83 × 170.15
  4. Step 4: Simplify right side
    211.61x = 49,654.87
  5. Step 5: Solve for x
    x = 49,654.87/211.61
  6. Step 6: Final answer
    x = 234.66

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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.