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Finding the Fourth Proportional to 122.48, 168.93 and 78.23

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Solution

The fourth proportional to 122.48, 168.93 and 78.23 is: 107.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.48 : 168.93 = 78.23 : x
  2. Step 2: Convert to fraction form
    122.48/168.93 = 78.23/x
  3. Step 3: Cross multiply
    122.48x = 168.93 × 78.23
  4. Step 4: Simplify right side
    122.48x = 13,215.82
  5. Step 5: Solve for x
    x = 13,215.82/122.48
  6. Step 6: Final answer
    x = 107.90

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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.