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Finding the Fourth Proportional to 211.33, 291.65 and 128.48

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Solution

The fourth proportional to 211.33, 291.65 and 128.48 is: 177.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.33 : 291.65 = 128.48 : x
  2. Step 2: Convert to fraction form
    211.33/291.65 = 128.48/x
  3. Step 3: Cross multiply
    211.33x = 291.65 × 128.48
  4. Step 4: Simplify right side
    211.33x = 37,469.09
  5. Step 5: Solve for x
    x = 37,469.09/211.33
  6. Step 6: Final answer
    x = 177.30

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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.