Home / 1,279.45-1,919.21-499.42

Finding the Fourth Proportional to 1,279.45, 1,919.21 and 499.42

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Solution

The fourth proportional to 1,279.45, 1,919.21 and 499.42 is: 749.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.45 : 1,919.21 = 499.42 : x
  2. Step 2: Convert to fraction form
    1,279.45/1,919.21 = 499.42/x
  3. Step 3: Cross multiply
    1,279.45x = 1,919.21 × 499.42
  4. Step 4: Simplify right side
    1,279.45x = 958,491.86
  5. Step 5: Solve for x
    x = 958,491.86/1,279.45
  6. Step 6: Final answer
    x = 749.14

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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.