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Finding the Fourth Proportional to 219.78, 303.44 and 136.98

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Solution

The fourth proportional to 219.78, 303.44 and 136.98 is: 189.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.78 : 303.44 = 136.98 : x
  2. Step 2: Convert to fraction form
    219.78/303.44 = 136.98/x
  3. Step 3: Cross multiply
    219.78x = 303.44 × 136.98
  4. Step 4: Simplify right side
    219.78x = 41,564.53
  5. Step 5: Solve for x
    x = 41,564.53/219.78
  6. Step 6: Final answer
    x = 189.12

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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.