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Finding the Fourth Proportional to 154.99, 232.34 and 76.88

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Solution

The fourth proportional to 154.99, 232.34 and 76.88 is: 115.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.99 : 232.34 = 76.88 : x
  2. Step 2: Convert to fraction form
    154.99/232.34 = 76.88/x
  3. Step 3: Cross multiply
    154.99x = 232.34 × 76.88
  4. Step 4: Simplify right side
    154.99x = 17,861.91
  5. Step 5: Solve for x
    x = 17,861.91/154.99
  6. Step 6: Final answer
    x = 115.25

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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.