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Finding the Fourth Proportional to 211.65, 291.84 and 136.77

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Solution

The fourth proportional to 211.65, 291.84 and 136.77 is: 188.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.65 : 291.84 = 136.77 : x
  2. Step 2: Convert to fraction form
    211.65/291.84 = 136.77/x
  3. Step 3: Cross multiply
    211.65x = 291.84 × 136.77
  4. Step 4: Simplify right side
    211.65x = 39,914.96
  5. Step 5: Solve for x
    x = 39,914.96/211.65
  6. Step 6: Final answer
    x = 188.59

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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.