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Finding the Fourth Proportional to 211.56, 315.96 and 171.06

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Solution

The fourth proportional to 211.56, 315.96 and 171.06 is: 255.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.56 : 315.96 = 171.06 : x
  2. Step 2: Convert to fraction form
    211.56/315.96 = 171.06/x
  3. Step 3: Cross multiply
    211.56x = 315.96 × 171.06
  4. Step 4: Simplify right side
    211.56x = 54,048.12
  5. Step 5: Solve for x
    x = 54,048.12/211.56
  6. Step 6: Final answer
    x = 255.47

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.