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Finding the Fourth Proportional to 211.44, 291.70 and 133.80

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Solution

The fourth proportional to 211.44, 291.70 and 133.80 is: 184.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.44 : 291.70 = 133.80 : x
  2. Step 2: Convert to fraction form
    211.44/291.70 = 133.80/x
  3. Step 3: Cross multiply
    211.44x = 291.70 × 133.80
  4. Step 4: Simplify right side
    211.44x = 39,029.46
  5. Step 5: Solve for x
    x = 39,029.46/211.44
  6. Step 6: Final answer
    x = 184.59

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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.