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Finding the Fourth Proportional to 165.76, 248.25 and 99.90

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Solution

The fourth proportional to 165.76, 248.25 and 99.90 is: 149.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.76 : 248.25 = 99.90 : x
  2. Step 2: Convert to fraction form
    165.76/248.25 = 99.90/x
  3. Step 3: Cross multiply
    165.76x = 248.25 × 99.90
  4. Step 4: Simplify right side
    165.76x = 24,800.18
  5. Step 5: Solve for x
    x = 24,800.18/165.76
  6. Step 6: Final answer
    x = 149.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.