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Finding the Fourth Proportional to 216.64, 324.88 and 108.40

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Solution

The fourth proportional to 216.64, 324.88 and 108.40 is: 162.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.64 : 324.88 = 108.40 : x
  2. Step 2: Convert to fraction form
    216.64/324.88 = 108.40/x
  3. Step 3: Cross multiply
    216.64x = 324.88 × 108.40
  4. Step 4: Simplify right side
    216.64x = 35,216.99
  5. Step 5: Solve for x
    x = 35,216.99/216.64
  6. Step 6: Final answer
    x = 162.56

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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.