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Finding the Fourth Proportional to 143.33, 197.85 and 87.33

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Solution

The fourth proportional to 143.33, 197.85 and 87.33 is: 120.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.33 : 197.85 = 87.33 : x
  2. Step 2: Convert to fraction form
    143.33/197.85 = 87.33/x
  3. Step 3: Cross multiply
    143.33x = 197.85 × 87.33
  4. Step 4: Simplify right side
    143.33x = 17,278.24
  5. Step 5: Solve for x
    x = 17,278.24/143.33
  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.