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Finding the Fourth Proportional to 155.40, 214.26 and 122.52

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Solution

The fourth proportional to 155.40, 214.26 and 122.52 is: 168.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.40 : 214.26 = 122.52 : x
  2. Step 2: Convert to fraction form
    155.40/214.26 = 122.52/x
  3. Step 3: Cross multiply
    155.40x = 214.26 × 122.52
  4. Step 4: Simplify right side
    155.40x = 26,251.14
  5. Step 5: Solve for x
    x = 26,251.14/155.40
  6. Step 6: Final answer
    x = 168.93

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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.