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Finding the Fourth Proportional to 218.51, 328.68 and 216.68

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Solution

The fourth proportional to 218.51, 328.68 and 216.68 is: 325.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.51 : 328.68 = 216.68 : x
  2. Step 2: Convert to fraction form
    218.51/328.68 = 216.68/x
  3. Step 3: Cross multiply
    218.51x = 328.68 × 216.68
  4. Step 4: Simplify right side
    218.51x = 71,218.38
  5. Step 5: Solve for x
    x = 71,218.38/218.51
  6. Step 6: Final answer
    x = 325.93

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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.