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Finding the Fourth Proportional to 219.12, 302.18 and 199.50

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Solution

The fourth proportional to 219.12, 302.18 and 199.50 is: 275.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.12 : 302.18 = 199.50 : x
  2. Step 2: Convert to fraction form
    219.12/302.18 = 199.50/x
  3. Step 3: Cross multiply
    219.12x = 302.18 × 199.50
  4. Step 4: Simplify right side
    219.12x = 60,284.91
  5. Step 5: Solve for x
    x = 60,284.91/219.12
  6. Step 6: Final answer
    x = 275.12

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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.