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Finding the Fourth Proportional to 499.80, 690.30 and 325.56

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Solution

The fourth proportional to 499.80, 690.30 and 325.56 is: 449.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.80 : 690.30 = 325.56 : x
  2. Step 2: Convert to fraction form
    499.80/690.30 = 325.56/x
  3. Step 3: Cross multiply
    499.80x = 690.30 × 325.56
  4. Step 4: Simplify right side
    499.80x = 224,734.07
  5. Step 5: Solve for x
    x = 224,734.07/499.80
  6. Step 6: Final answer
    x = 449.65

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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.