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Finding the Fourth Proportional to 165.26, 228 and 99.74

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Solution

The fourth proportional to 165.26, 228 and 99.74 is: 137.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.26 : 228 = 99.74 : x
  2. Step 2: Convert to fraction form
    165.26/228 = 99.74/x
  3. Step 3: Cross multiply
    165.26x = 228 × 99.74
  4. Step 4: Simplify right side
    165.26x = 22,740.72
  5. Step 5: Solve for x
    x = 22,740.72/165.26
  6. Step 6: Final answer
    x = 137.61

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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.