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Finding the Fourth Proportional to 219.15, 302.42 and 131.85

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Solution

The fourth proportional to 219.15, 302.42 and 131.85 is: 181.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.15 : 302.42 = 131.85 : x
  2. Step 2: Convert to fraction form
    219.15/302.42 = 131.85/x
  3. Step 3: Cross multiply
    219.15x = 302.42 × 131.85
  4. Step 4: Simplify right side
    219.15x = 39,874.41
  5. Step 5: Solve for x
    x = 39,874.41/219.15
  6. Step 6: Final answer
    x = 181.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.