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Finding the Fourth Proportional to 98.08, 135.34 and 61.28

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Solution

The fourth proportional to 98.08, 135.34 and 61.28 is: 84.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.08 : 135.34 = 61.28 : x
  2. Step 2: Convert to fraction form
    98.08/135.34 = 61.28/x
  3. Step 3: Cross multiply
    98.08x = 135.34 × 61.28
  4. Step 4: Simplify right side
    98.08x = 8,293.64
  5. Step 5: Solve for x
    x = 8,293.64/98.08
  6. Step 6: Final answer
    x = 84.56

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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.