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Finding the Fourth Proportional to 122.48, 170.15 and 121.35

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Solution

The fourth proportional to 122.48, 170.15 and 121.35 is: 168.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.48 : 170.15 = 121.35 : x
  2. Step 2: Convert to fraction form
    122.48/170.15 = 121.35/x
  3. Step 3: Cross multiply
    122.48x = 170.15 × 121.35
  4. Step 4: Simplify right side
    122.48x = 20,647.10
  5. Step 5: Solve for x
    x = 20,647.10/122.48
  6. Step 6: Final answer
    x = 168.58

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.