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Finding the Fourth Proportional to 211.11, 291.31 and 128.24

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Solution

The fourth proportional to 211.11, 291.31 and 128.24 is: 176.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.11 : 291.31 = 128.24 : x
  2. Step 2: Convert to fraction form
    211.11/291.31 = 128.24/x
  3. Step 3: Cross multiply
    211.11x = 291.31 × 128.24
  4. Step 4: Simplify right side
    211.11x = 37,355.82
  5. Step 5: Solve for x
    x = 37,355.82/211.11
  6. Step 6: Final answer
    x = 176.95

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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.