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Finding the Fourth Proportional to 143.44, 197.87 and 87.39

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Solution

The fourth proportional to 143.44, 197.87 and 87.39 is: 120.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.44 : 197.87 = 87.39 : x
  2. Step 2: Convert to fraction form
    143.44/197.87 = 87.39/x
  3. Step 3: Cross multiply
    143.44x = 197.87 × 87.39
  4. Step 4: Simplify right side
    143.44x = 17,291.42
  5. Step 5: Solve for x
    x = 17,291.42/143.44
  6. Step 6: Final answer
    x = 120.55

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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.