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Finding the Fourth Proportional to 218.40, 325.56 and 211.20

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Solution

The fourth proportional to 218.40, 325.56 and 211.20 is: 314.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.40 : 325.56 = 211.20 : x
  2. Step 2: Convert to fraction form
    218.40/325.56 = 211.20/x
  3. Step 3: Cross multiply
    218.40x = 325.56 × 211.20
  4. Step 4: Simplify right side
    218.40x = 68,758.27
  5. Step 5: Solve for x
    x = 68,758.27/218.40
  6. Step 6: Final answer
    x = 314.83

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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.