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Finding the Fourth Proportional to 219.92, 330.16 and 139.10

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Solution

The fourth proportional to 219.92, 330.16 and 139.10 is: 208.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.92 : 330.16 = 139.10 : x
  2. Step 2: Convert to fraction form
    219.92/330.16 = 139.10/x
  3. Step 3: Cross multiply
    219.92x = 330.16 × 139.10
  4. Step 4: Simplify right side
    219.92x = 45,925.26
  5. Step 5: Solve for x
    x = 45,925.26/219.92
  6. Step 6: Final answer
    x = 208.83

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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.