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Finding the Fourth Proportional to 499.19, 688.69 and 310.05

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Solution

The fourth proportional to 499.19, 688.69 and 310.05 is: 427.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.19 : 688.69 = 310.05 : x
  2. Step 2: Convert to fraction form
    499.19/688.69 = 310.05/x
  3. Step 3: Cross multiply
    499.19x = 688.69 × 310.05
  4. Step 4: Simplify right side
    499.19x = 213,527.56
  5. Step 5: Solve for x
    x = 213,527.56/499.19
  6. Step 6: Final answer
    x = 427.75

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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.