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Finding the Fourth Proportional to 155.15, 232.79 and 111.87

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Solution

The fourth proportional to 155.15, 232.79 and 111.87 is: 167.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.15 : 232.79 = 111.87 : x
  2. Step 2: Convert to fraction form
    155.15/232.79 = 111.87/x
  3. Step 3: Cross multiply
    155.15x = 232.79 × 111.87
  4. Step 4: Simplify right side
    155.15x = 26,041.49
  5. Step 5: Solve for x
    x = 26,041.49/155.15
  6. Step 6: Final answer
    x = 167.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.