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Finding the Fourth Proportional to 211.53, 317.31 and 165.79

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Solution

The fourth proportional to 211.53, 317.31 and 165.79 is: 248.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.53 : 317.31 = 165.79 : x
  2. Step 2: Convert to fraction form
    211.53/317.31 = 165.79/x
  3. Step 3: Cross multiply
    211.53x = 317.31 × 165.79
  4. Step 4: Simplify right side
    211.53x = 52,606.82
  5. Step 5: Solve for x
    x = 52,606.82/211.53
  6. Step 6: Final answer
    x = 248.70

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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.