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Finding the Fourth Proportional to 143.48, 198.22 and 99.95

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Solution

The fourth proportional to 143.48, 198.22 and 99.95 is: 138.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.48 : 198.22 = 99.95 : x
  2. Step 2: Convert to fraction form
    143.48/198.22 = 99.95/x
  3. Step 3: Cross multiply
    143.48x = 198.22 × 99.95
  4. Step 4: Simplify right side
    143.48x = 19,810.85
  5. Step 5: Solve for x
    x = 19,810.85/143.48
  6. Step 6: Final answer
    x = 138.07

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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.