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Finding the Fourth Proportional to 499.38, 689.11 and 275.30

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Solution

The fourth proportional to 499.38, 689.11 and 275.30 is: 379.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.38 : 689.11 = 275.30 : x
  2. Step 2: Convert to fraction form
    499.38/689.11 = 275.30/x
  3. Step 3: Cross multiply
    499.38x = 689.11 × 275.30
  4. Step 4: Simplify right side
    499.38x = 189,714.31
  5. Step 5: Solve for x
    x = 189,714.31/499.38
  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.