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Finding the Fourth Proportional to 499.34, 687.20 and 447.50

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Solution

The fourth proportional to 499.34, 687.20 and 447.50 is: 615.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.34 : 687.20 = 447.50 : x
  2. Step 2: Convert to fraction form
    499.34/687.20 = 447.50/x
  3. Step 3: Cross multiply
    499.34x = 687.20 × 447.50
  4. Step 4: Simplify right side
    499.34x = 307,522
  5. Step 5: Solve for x
    x = 307,522/499.34
  6. Step 6: Final answer
    x = 615.86

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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.