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Finding the Fourth Proportional to 211.14, 291.36 and 128.29

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Solution

The fourth proportional to 211.14, 291.36 and 128.29 is: 177.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.14 : 291.36 = 128.29 : x
  2. Step 2: Convert to fraction form
    211.14/291.36 = 128.29/x
  3. Step 3: Cross multiply
    211.14x = 291.36 × 128.29
  4. Step 4: Simplify right side
    211.14x = 37,378.57
  5. Step 5: Solve for x
    x = 37,378.57/211.14
  6. Step 6: Final answer
    x = 177.03

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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.