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Finding the Fourth Proportional to 98.44, 135.72 and 78.83

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Solution

The fourth proportional to 98.44, 135.72 and 78.83 is: 108.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.44 : 135.72 = 78.83 : x
  2. Step 2: Convert to fraction form
    98.44/135.72 = 78.83/x
  3. Step 3: Cross multiply
    98.44x = 135.72 × 78.83
  4. Step 4: Simplify right side
    98.44x = 10,698.81
  5. Step 5: Solve for x
    x = 10,698.81/98.44
  6. Step 6: Final answer
    x = 108.68

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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.