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Finding the Fourth Proportional to 143.09, 197.48 and 87.83

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Solution

The fourth proportional to 143.09, 197.48 and 87.83 is: 121.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.09 : 197.48 = 87.83 : x
  2. Step 2: Convert to fraction form
    143.09/197.48 = 87.83/x
  3. Step 3: Cross multiply
    143.09x = 197.48 × 87.83
  4. Step 4: Simplify right side
    143.09x = 17,343.24
  5. Step 5: Solve for x
    x = 17,343.24/143.09
  6. Step 6: Final answer
    x = 121.21

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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.