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Finding the Fourth Proportional to 219.11, 328.44 and 103.49

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Solution

The fourth proportional to 219.11, 328.44 and 103.49 is: 155.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.11 : 328.44 = 103.49 : x
  2. Step 2: Convert to fraction form
    219.11/328.44 = 103.49/x
  3. Step 3: Cross multiply
    219.11x = 328.44 × 103.49
  4. Step 4: Simplify right side
    219.11x = 33,988.61
  5. Step 5: Solve for x
    x = 33,988.61/219.11
  6. Step 6: Final answer
    x = 155.12

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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.