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Finding the Fourth Proportional to 155.44, 214.50 and 111.28

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Solution

The fourth proportional to 155.44, 214.50 and 111.28 is: 153.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.44 : 214.50 = 111.28 : x
  2. Step 2: Convert to fraction form
    155.44/214.50 = 111.28/x
  3. Step 3: Cross multiply
    155.44x = 214.50 × 111.28
  4. Step 4: Simplify right side
    155.44x = 23,869.56
  5. Step 5: Solve for x
    x = 23,869.56/155.44
  6. Step 6: Final answer
    x = 153.56

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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.