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Finding the Fourth Proportional to 211.48, 315.99 and 165.72

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Solution

The fourth proportional to 211.48, 315.99 and 165.72 is: 247.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.48 : 315.99 = 165.72 : x
  2. Step 2: Convert to fraction form
    211.48/315.99 = 165.72/x
  3. Step 3: Cross multiply
    211.48x = 315.99 × 165.72
  4. Step 4: Simplify right side
    211.48x = 52,365.86
  5. Step 5: Solve for x
    x = 52,365.86/211.48
  6. Step 6: Final answer
    x = 247.62

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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.