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Finding the Fourth Proportional to 219.69, 303.31 and 142.20

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Solution

The fourth proportional to 219.69, 303.31 and 142.20 is: 196.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.69 : 303.31 = 142.20 : x
  2. Step 2: Convert to fraction form
    219.69/303.31 = 142.20/x
  3. Step 3: Cross multiply
    219.69x = 303.31 × 142.20
  4. Step 4: Simplify right side
    219.69x = 43,130.68
  5. Step 5: Solve for x
    x = 43,130.68/219.69
  6. Step 6: Final answer
    x = 196.33

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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.