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Finding the Fourth Proportional to 499.20, 749.28 and 255.90

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Solution

The fourth proportional to 499.20, 749.28 and 255.90 is: 384.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.20 : 749.28 = 255.90 : x
  2. Step 2: Convert to fraction form
    499.20/749.28 = 255.90/x
  3. Step 3: Cross multiply
    499.20x = 749.28 × 255.90
  4. Step 4: Simplify right side
    499.20x = 191,740.75
  5. Step 5: Solve for x
    x = 191,740.75/499.20
  6. Step 6: Final answer
    x = 384.10

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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.