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Finding the Fourth Proportional to 499.36, 689.11 and 275.29

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Solution

The fourth proportional to 499.36, 689.11 and 275.29 is: 379.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.36 : 689.11 = 275.29 : x
  2. Step 2: Convert to fraction form
    499.36/689.11 = 275.29/x
  3. Step 3: Cross multiply
    499.36x = 689.11 × 275.29
  4. Step 4: Simplify right side
    499.36x = 189,704.54
  5. Step 5: Solve for x
    x = 189,704.54/499.36
  6. Step 6: Final answer
    x = 379.90

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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.