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Finding the Fourth Proportional to 219, 328.44 and 165.21

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Solution

The fourth proportional to 219, 328.44 and 165.21 is: 247.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    219 : 328.44 = 165.21 : x
  2. Step 2: Convert to fraction form
    219/328.44 = 165.21/x
  3. Step 3: Cross multiply
    219x = 328.44 × 165.21
  4. Step 4: Simplify right side
    219x = 54,261.57
  5. Step 5: Solve for x
    x = 54,261.57/219
  6. Step 6: Final answer
    x = 247.77

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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.