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Finding the Fourth Proportional to 219.10, 328.60 and 82.11

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Solution

The fourth proportional to 219.10, 328.60 and 82.11 is: 123.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.10 : 328.60 = 82.11 : x
  2. Step 2: Convert to fraction form
    219.10/328.60 = 82.11/x
  3. Step 3: Cross multiply
    219.10x = 328.60 × 82.11
  4. Step 4: Simplify right side
    219.10x = 26,981.86
  5. Step 5: Solve for x
    x = 26,981.86/219.10
  6. Step 6: Final answer
    x = 123.15

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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.