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Finding the Fourth Proportional to 499.72, 749.83 and 280.21

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Solution

The fourth proportional to 499.72, 749.83 and 280.21 is: 420.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.72 : 749.83 = 280.21 : x
  2. Step 2: Convert to fraction form
    499.72/749.83 = 280.21/x
  3. Step 3: Cross multiply
    499.72x = 749.83 × 280.21
  4. Step 4: Simplify right side
    499.72x = 210,109.86
  5. Step 5: Solve for x
    x = 210,109.86/499.72
  6. Step 6: Final answer
    x = 420.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.