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Finding the Fourth Proportional to 211.78, 316.91 and 125.16

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Solution

The fourth proportional to 211.78, 316.91 and 125.16 is: 187.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.78 : 316.91 = 125.16 : x
  2. Step 2: Convert to fraction form
    211.78/316.91 = 125.16/x
  3. Step 3: Cross multiply
    211.78x = 316.91 × 125.16
  4. Step 4: Simplify right side
    211.78x = 39,665.36
  5. Step 5: Solve for x
    x = 39,665.36/211.78
  6. Step 6: Final answer
    x = 187.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.