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Finding the Fourth Proportional to 143.47, 198.02 and 99.31

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Solution

The fourth proportional to 143.47, 198.02 and 99.31 is: 137.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.47 : 198.02 = 99.31 : x
  2. Step 2: Convert to fraction form
    143.47/198.02 = 99.31/x
  3. Step 3: Cross multiply
    143.47x = 198.02 × 99.31
  4. Step 4: Simplify right side
    143.47x = 19,665.37
  5. Step 5: Solve for x
    x = 19,665.37/143.47
  6. Step 6: Final answer
    x = 137.07

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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.