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Finding the Fourth Proportional to 98.45, 135.81 and 61.64

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Solution

The fourth proportional to 98.45, 135.81 and 61.64 is: 85.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.45 : 135.81 = 61.64 : x
  2. Step 2: Convert to fraction form
    98.45/135.81 = 61.64/x
  3. Step 3: Cross multiply
    98.45x = 135.81 × 61.64
  4. Step 4: Simplify right side
    98.45x = 8,371.33
  5. Step 5: Solve for x
    x = 8,371.33/98.45
  6. Step 6: Final answer
    x = 85.03

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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.