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Finding the Fourth Proportional to 309.91, 465.02 and 219.19

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Solution

The fourth proportional to 309.91, 465.02 and 219.19 is: 328.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.91 : 465.02 = 219.19 : x
  2. Step 2: Convert to fraction form
    309.91/465.02 = 219.19/x
  3. Step 3: Cross multiply
    309.91x = 465.02 × 219.19
  4. Step 4: Simplify right side
    309.91x = 101,928.90
  5. Step 5: Solve for x
    x = 101,928.90/309.91
  6. Step 6: Final answer
    x = 328.90

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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.