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Finding the Fourth Proportional to 155.20, 214.17 and 85.25

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Solution

The fourth proportional to 155.20, 214.17 and 85.25 is: 117.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.20 : 214.17 = 85.25 : x
  2. Step 2: Convert to fraction form
    155.20/214.17 = 85.25/x
  3. Step 3: Cross multiply
    155.20x = 214.17 × 85.25
  4. Step 4: Simplify right side
    155.20x = 18,258.53
  5. Step 5: Solve for x
    x = 18,258.53/155.20
  6. Step 6: Final answer
    x = 117.65

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.