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Finding the Fourth Proportional to 165.83, 229.28 and 138.20

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Solution

The fourth proportional to 165.83, 229.28 and 138.20 is: 191.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.83 : 229.28 = 138.20 : x
  2. Step 2: Convert to fraction form
    165.83/229.28 = 138.20/x
  3. Step 3: Cross multiply
    165.83x = 229.28 × 138.20
  4. Step 4: Simplify right side
    165.83x = 31,684.66
  5. Step 5: Solve for x
    x = 31,684.66/165.83
  6. Step 6: Final answer
    x = 191.07

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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.