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Finding the Fourth Proportional to 143.99, 198.71 and 78.50

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Solution

The fourth proportional to 143.99, 198.71 and 78.50 is: 108.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.99 : 198.71 = 78.50 : x
  2. Step 2: Convert to fraction form
    143.99/198.71 = 78.50/x
  3. Step 3: Cross multiply
    143.99x = 198.71 × 78.50
  4. Step 4: Simplify right side
    143.99x = 15,598.68
  5. Step 5: Solve for x
    x = 15,598.68/143.99
  6. Step 6: Final answer
    x = 108.33

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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.