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Finding the Fourth Proportional to 218.18, 325.18 and 216.56

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Solution

The fourth proportional to 218.18, 325.18 and 216.56 is: 322.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.18 : 325.18 = 216.56 : x
  2. Step 2: Convert to fraction form
    218.18/325.18 = 216.56/x
  3. Step 3: Cross multiply
    218.18x = 325.18 × 216.56
  4. Step 4: Simplify right side
    218.18x = 70,420.98
  5. Step 5: Solve for x
    x = 70,420.98/218.18
  6. Step 6: Final answer
    x = 322.77

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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.