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Finding the Fourth Proportional to 216.40, 324.61 and 68.14

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Solution

The fourth proportional to 216.40, 324.61 and 68.14 is: 102.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.40 : 324.61 = 68.14 : x
  2. Step 2: Convert to fraction form
    216.40/324.61 = 68.14/x
  3. Step 3: Cross multiply
    216.40x = 324.61 × 68.14
  4. Step 4: Simplify right side
    216.40x = 22,118.93
  5. Step 5: Solve for x
    x = 22,118.93/216.40
  6. Step 6: Final answer
    x = 102.21

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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.