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Finding the Fourth Proportional to 155.08, 213.62 and 111.34

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Solution

The fourth proportional to 155.08, 213.62 and 111.34 is: 153.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.08 : 213.62 = 111.34 : x
  2. Step 2: Convert to fraction form
    155.08/213.62 = 111.34/x
  3. Step 3: Cross multiply
    155.08x = 213.62 × 111.34
  4. Step 4: Simplify right side
    155.08x = 23,784.45
  5. Step 5: Solve for x
    x = 23,784.45/155.08
  6. Step 6: Final answer
    x = 153.37

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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.