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Finding the Fourth Proportional to 499.31, 689.08 and 310.22

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Solution

The fourth proportional to 499.31, 689.08 and 310.22 is: 428.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.31 : 689.08 = 310.22 : x
  2. Step 2: Convert to fraction form
    499.31/689.08 = 310.22/x
  3. Step 3: Cross multiply
    499.31x = 689.08 × 310.22
  4. Step 4: Simplify right side
    499.31x = 213,767.64
  5. Step 5: Solve for x
    x = 213,767.64/499.31
  6. Step 6: Final answer
    x = 428.13

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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.