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Finding the Fourth Proportional to 1,279.42, 1,919.07 and 355.03

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Solution

The fourth proportional to 1,279.42, 1,919.07 and 355.03 is: 532.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.42 : 1,919.07 = 355.03 : x
  2. Step 2: Convert to fraction form
    1,279.42/1,919.07 = 355.03/x
  3. Step 3: Cross multiply
    1,279.42x = 1,919.07 × 355.03
  4. Step 4: Simplify right side
    1,279.42x = 681,322.62
  5. Step 5: Solve for x
    x = 681,322.62/1,279.42
  6. Step 6: Final answer
    x = 532.53

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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.