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Finding the Fourth Proportional to 143.31, 197.81 and 88.02

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Solution

The fourth proportional to 143.31, 197.81 and 88.02 is: 121.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.31 : 197.81 = 88.02 : x
  2. Step 2: Convert to fraction form
    143.31/197.81 = 88.02/x
  3. Step 3: Cross multiply
    143.31x = 197.81 × 88.02
  4. Step 4: Simplify right side
    143.31x = 17,411.54
  5. Step 5: Solve for x
    x = 17,411.54/143.31
  6. Step 6: Final answer
    x = 121.50

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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.