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Finding the Fourth Proportional to 155.12, 231.62 and 125.90

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Solution

The fourth proportional to 155.12, 231.62 and 125.90 is: 187.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.12 : 231.62 = 125.90 : x
  2. Step 2: Convert to fraction form
    155.12/231.62 = 125.90/x
  3. Step 3: Cross multiply
    155.12x = 231.62 × 125.90
  4. Step 4: Simplify right side
    155.12x = 29,160.96
  5. Step 5: Solve for x
    x = 29,160.96/155.12
  6. Step 6: Final answer
    x = 187.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.