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Finding the Fourth Proportional to 143.79, 198.43 and 84.77

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Solution

The fourth proportional to 143.79, 198.43 and 84.77 is: 116.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.79 : 198.43 = 84.77 : x
  2. Step 2: Convert to fraction form
    143.79/198.43 = 84.77/x
  3. Step 3: Cross multiply
    143.79x = 198.43 × 84.77
  4. Step 4: Simplify right side
    143.79x = 16,819.92
  5. Step 5: Solve for x
    x = 16,819.92/143.79
  6. Step 6: Final answer
    x = 116.98

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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.