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Finding the Fourth Proportional to 218.72, 325.90 and 211.52

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Solution

The fourth proportional to 218.72, 325.90 and 211.52 is: 315.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.72 : 325.90 = 211.52 : x
  2. Step 2: Convert to fraction form
    218.72/325.90 = 211.52/x
  3. Step 3: Cross multiply
    218.72x = 325.90 × 211.52
  4. Step 4: Simplify right side
    218.72x = 68,934.37
  5. Step 5: Solve for x
    x = 68,934.37/218.72
  6. Step 6: Final answer
    x = 315.17

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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.