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Finding the Fourth Proportional to 1,279.35, 1,919.05 and 401.83

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Solution

The fourth proportional to 1,279.35, 1,919.05 and 401.83 is: 602.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.35 : 1,919.05 = 401.83 : x
  2. Step 2: Convert to fraction form
    1,279.35/1,919.05 = 401.83/x
  3. Step 3: Cross multiply
    1,279.35x = 1,919.05 × 401.83
  4. Step 4: Simplify right side
    1,279.35x = 771,129.85
  5. Step 5: Solve for x
    x = 771,129.85/1,279.35
  6. Step 6: Final answer
    x = 602.75

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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.