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Finding the Fourth Proportional to 99.21, 135.84 and 98.90

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Solution

The fourth proportional to 99.21, 135.84 and 98.90 is: 135.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.21 : 135.84 = 98.90 : x
  2. Step 2: Convert to fraction form
    99.21/135.84 = 98.90/x
  3. Step 3: Cross multiply
    99.21x = 135.84 × 98.90
  4. Step 4: Simplify right side
    99.21x = 13,433.90
  5. Step 5: Solve for x
    x = 13,433.90/99.21
  6. Step 6: Final answer
    x = 135.41

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.