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Finding the Fourth Proportional to 499.50, 689.11 and 331.53

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Solution

The fourth proportional to 499.50, 689.11 and 331.53 is: 457.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.50 : 689.11 = 331.53 : x
  2. Step 2: Convert to fraction form
    499.50/689.11 = 331.53/x
  3. Step 3: Cross multiply
    499.50x = 689.11 × 331.53
  4. Step 4: Simplify right side
    499.50x = 228,458.98
  5. Step 5: Solve for x
    x = 228,458.98/499.50
  6. Step 6: Final answer
    x = 457.38

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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.