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Finding the Third Proportional to 90.84 and 99.84

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Solution

The third proportional to 90.84 and 99.84 is: 109.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.84 : 99.84 = 99.84 : x
  2. Step 2: Convert to fraction form
    90.84/99.84 = 99.84/x
  3. Step 3: Cross multiply
    90.84x = 99.84 × 99.84
  4. Step 4: Simplify right side
    90.84x = 9,968.77
  5. Step 5: Solve for x
    x = 9,968.77/90.84
  6. Step 6: Final answer
    x = 109.74

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.