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Finding the Fourth Proportional to 211.16, 291.36 and 123.79

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Solution

The fourth proportional to 211.16, 291.36 and 123.79 is: 170.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.16 : 291.36 = 123.79 : x
  2. Step 2: Convert to fraction form
    211.16/291.36 = 123.79/x
  3. Step 3: Cross multiply
    211.16x = 291.36 × 123.79
  4. Step 4: Simplify right side
    211.16x = 36,066.73
  5. Step 5: Solve for x
    x = 36,066.73/211.16
  6. Step 6: Final answer
    x = 170.80

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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.