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Finding the Fourth Proportional to 98.10, 135.06 and 85.86

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Solution

The fourth proportional to 98.10, 135.06 and 85.86 is: 118.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.10 : 135.06 = 85.86 : x
  2. Step 2: Convert to fraction form
    98.10/135.06 = 85.86/x
  3. Step 3: Cross multiply
    98.10x = 135.06 × 85.86
  4. Step 4: Simplify right side
    98.10x = 11,596.25
  5. Step 5: Solve for x
    x = 11,596.25/98.10
  6. Step 6: Final answer
    x = 118.21

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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.