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Finding the Fourth Proportional to 215.64, 297.53 and 122.39

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Solution

The fourth proportional to 215.64, 297.53 and 122.39 is: 168.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.64 : 297.53 = 122.39 : x
  2. Step 2: Convert to fraction form
    215.64/297.53 = 122.39/x
  3. Step 3: Cross multiply
    215.64x = 297.53 × 122.39
  4. Step 4: Simplify right side
    215.64x = 36,413.70
  5. Step 5: Solve for x
    x = 36,413.70/215.64
  6. Step 6: Final answer
    x = 168.86

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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.