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Finding the Fourth Proportional to 143.60, 198.18 and 78.11

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Solution

The fourth proportional to 143.60, 198.18 and 78.11 is: 107.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.60 : 198.18 = 78.11 : x
  2. Step 2: Convert to fraction form
    143.60/198.18 = 78.11/x
  3. Step 3: Cross multiply
    143.60x = 198.18 × 78.11
  4. Step 4: Simplify right side
    143.60x = 15,479.30
  5. Step 5: Solve for x
    x = 15,479.30/143.60
  6. Step 6: Final answer
    x = 107.79

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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.