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Finding the Fourth Proportional to 219.04, 328.20 and 103.21

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Solution

The fourth proportional to 219.04, 328.20 and 103.21 is: 154.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.04 : 328.20 = 103.21 : x
  2. Step 2: Convert to fraction form
    219.04/328.20 = 103.21/x
  3. Step 3: Cross multiply
    219.04x = 328.20 × 103.21
  4. Step 4: Simplify right side
    219.04x = 33,872.90
  5. Step 5: Solve for x
    x = 33,872.90/219.04
  6. Step 6: Final answer
    x = 154.64

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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.