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Finding the Fourth Proportional to 143.99, 198.75 and 102.66

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Solution

The fourth proportional to 143.99, 198.75 and 102.66 is: 141.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.99 : 198.75 = 102.66 : x
  2. Step 2: Convert to fraction form
    143.99/198.75 = 102.66/x
  3. Step 3: Cross multiply
    143.99x = 198.75 × 102.66
  4. Step 4: Simplify right side
    143.99x = 20,403.68
  5. Step 5: Solve for x
    x = 20,403.68/143.99
  6. Step 6: Final answer
    x = 141.70

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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.