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Finding the Fourth Proportional to 165.16, 247.28 and 113.72

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Solution

The fourth proportional to 165.16, 247.28 and 113.72 is: 170.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.16 : 247.28 = 113.72 : x
  2. Step 2: Convert to fraction form
    165.16/247.28 = 113.72/x
  3. Step 3: Cross multiply
    165.16x = 247.28 × 113.72
  4. Step 4: Simplify right side
    165.16x = 28,120.68
  5. Step 5: Solve for x
    x = 28,120.68/165.16
  6. Step 6: Final answer
    x = 170.26

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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.