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Finding the Fourth Proportional to 98.41, 135.64 and 67.31

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Solution

The fourth proportional to 98.41, 135.64 and 67.31 is: 92.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.41 : 135.64 = 67.31 : x
  2. Step 2: Convert to fraction form
    98.41/135.64 = 67.31/x
  3. Step 3: Cross multiply
    98.41x = 135.64 × 67.31
  4. Step 4: Simplify right side
    98.41x = 9,129.93
  5. Step 5: Solve for x
    x = 9,129.93/98.41
  6. Step 6: Final answer
    x = 92.77

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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.