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Finding the Fourth Proportional to 165.24, 248.85 and 138.36

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Solution

The fourth proportional to 165.24, 248.85 and 138.36 is: 208.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.24 : 248.85 = 138.36 : x
  2. Step 2: Convert to fraction form
    165.24/248.85 = 138.36/x
  3. Step 3: Cross multiply
    165.24x = 248.85 × 138.36
  4. Step 4: Simplify right side
    165.24x = 34,430.89
  5. Step 5: Solve for x
    x = 34,430.89/165.24
  6. Step 6: Final answer
    x = 208.37

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.