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Finding the Fourth Proportional to 211.28, 291.54 and 123.95

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Solution

The fourth proportional to 211.28, 291.54 and 123.95 is: 171.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.28 : 291.54 = 123.95 : x
  2. Step 2: Convert to fraction form
    211.28/291.54 = 123.95/x
  3. Step 3: Cross multiply
    211.28x = 291.54 × 123.95
  4. Step 4: Simplify right side
    211.28x = 36,136.38
  5. Step 5: Solve for x
    x = 36,136.38/211.28
  6. Step 6: Final answer
    x = 171.04

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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.