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Finding the Fourth Proportional to 499.38, 689.06 and 289.56

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Solution

The fourth proportional to 499.38, 689.06 and 289.56 is: 399.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.38 : 689.06 = 289.56 : x
  2. Step 2: Convert to fraction form
    499.38/689.06 = 289.56/x
  3. Step 3: Cross multiply
    499.38x = 689.06 × 289.56
  4. Step 4: Simplify right side
    499.38x = 199,524.21
  5. Step 5: Solve for x
    x = 199,524.21/499.38
  6. Step 6: Final answer
    x = 399.54

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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.