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Finding the Fourth Proportional to 499.05, 749.45 and 431.69

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Solution

The fourth proportional to 499.05, 749.45 and 431.69 is: 648.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.05 : 749.45 = 431.69 : x
  2. Step 2: Convert to fraction form
    499.05/749.45 = 431.69/x
  3. Step 3: Cross multiply
    499.05x = 749.45 × 431.69
  4. Step 4: Simplify right side
    499.05x = 323,527.40
  5. Step 5: Solve for x
    x = 323,527.40/499.05
  6. Step 6: Final answer
    x = 648.29

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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.