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Finding the Fourth Proportional to 330.78, 496.24 and 99.67

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Solution

The fourth proportional to 330.78, 496.24 and 99.67 is: 149.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.78 : 496.24 = 99.67 : x
  2. Step 2: Convert to fraction form
    330.78/496.24 = 99.67/x
  3. Step 3: Cross multiply
    330.78x = 496.24 × 99.67
  4. Step 4: Simplify right side
    330.78x = 49,460.61
  5. Step 5: Solve for x
    x = 49,460.61/330.78
  6. Step 6: Final answer
    x = 149.53

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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.