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Finding the Fourth Proportional to 218.92, 328.38 and 74.64

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Solution

The fourth proportional to 218.92, 328.38 and 74.64 is: 111.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.92 : 328.38 = 74.64 : x
  2. Step 2: Convert to fraction form
    218.92/328.38 = 74.64/x
  3. Step 3: Cross multiply
    218.92x = 328.38 × 74.64
  4. Step 4: Simplify right side
    218.92x = 24,510.28
  5. Step 5: Solve for x
    x = 24,510.28/218.92
  6. Step 6: Final answer
    x = 111.96

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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.