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Finding the Fourth Proportional to 143.32, 197.79 and 77.83

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Solution

The fourth proportional to 143.32, 197.79 and 77.83 is: 107.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.32 : 197.79 = 77.83 : x
  2. Step 2: Convert to fraction form
    143.32/197.79 = 77.83/x
  3. Step 3: Cross multiply
    143.32x = 197.79 × 77.83
  4. Step 4: Simplify right side
    143.32x = 15,393.31
  5. Step 5: Solve for x
    x = 15,393.31/143.32
  6. Step 6: Final answer
    x = 107.40

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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.