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Finding the Fourth Proportional to 98.18, 135.55 and 61.38

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Solution

The fourth proportional to 98.18, 135.55 and 61.38 is: 84.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.18 : 135.55 = 61.38 : x
  2. Step 2: Convert to fraction form
    98.18/135.55 = 61.38/x
  3. Step 3: Cross multiply
    98.18x = 135.55 × 61.38
  4. Step 4: Simplify right side
    98.18x = 8,320.06
  5. Step 5: Solve for x
    x = 8,320.06/98.18
  6. Step 6: Final answer
    x = 84.74

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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.