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Finding the Fourth Proportional to 211.28, 291.54 and 123.94

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Solution

The fourth proportional to 211.28, 291.54 and 123.94 is: 171.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.28 : 291.54 = 123.94 : x
  2. Step 2: Convert to fraction form
    211.28/291.54 = 123.94/x
  3. Step 3: Cross multiply
    211.28x = 291.54 × 123.94
  4. Step 4: Simplify right side
    211.28x = 36,133.47
  5. Step 5: Solve for x
    x = 36,133.47/211.28
  6. Step 6: Final answer
    x = 171.02

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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.