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Finding the Fourth Proportional to 98.22, 135.48 and 61.41

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Solution

The fourth proportional to 98.22, 135.48 and 61.41 is: 84.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.22 : 135.48 = 61.41 : x
  2. Step 2: Convert to fraction form
    98.22/135.48 = 61.41/x
  3. Step 3: Cross multiply
    98.22x = 135.48 × 61.41
  4. Step 4: Simplify right side
    98.22x = 8,319.83
  5. Step 5: Solve for x
    x = 8,319.83/98.22
  6. Step 6: Final answer
    x = 84.71

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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.