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Finding the Fourth Proportional to 143.79, 198.20 and 100.05

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Solution

The fourth proportional to 143.79, 198.20 and 100.05 is: 137.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.79 : 198.20 = 100.05 : x
  2. Step 2: Convert to fraction form
    143.79/198.20 = 100.05/x
  3. Step 3: Cross multiply
    143.79x = 198.20 × 100.05
  4. Step 4: Simplify right side
    143.79x = 19,829.41
  5. Step 5: Solve for x
    x = 19,829.41/143.79
  6. Step 6: Final answer
    x = 137.91

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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.