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Finding the Fourth Proportional to 117.24, 161.88 and 103.44

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Solution

The fourth proportional to 117.24, 161.88 and 103.44 is: 142.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.24 : 161.88 = 103.44 : x
  2. Step 2: Convert to fraction form
    117.24/161.88 = 103.44/x
  3. Step 3: Cross multiply
    117.24x = 161.88 × 103.44
  4. Step 4: Simplify right side
    117.24x = 16,744.87
  5. Step 5: Solve for x
    x = 16,744.87/117.24
  6. Step 6: Final answer
    x = 142.83

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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.