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Finding the Fourth Proportional to 211.16, 290.86 and 186.66

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Solution

The fourth proportional to 211.16, 290.86 and 186.66 is: 257.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.16 : 290.86 = 186.66 : x
  2. Step 2: Convert to fraction form
    211.16/290.86 = 186.66/x
  3. Step 3: Cross multiply
    211.16x = 290.86 × 186.66
  4. Step 4: Simplify right side
    211.16x = 54,291.46
  5. Step 5: Solve for x
    x = 54,291.46/211.16
  6. Step 6: Final answer
    x = 257.11

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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.