Home / 1,279.60-1,919.40-355.30

Finding the Fourth Proportional to 1,279.60, 1,919.40 and 355.30

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Solution

The fourth proportional to 1,279.60, 1,919.40 and 355.30 is: 532.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.60 : 1,919.40 = 355.30 : x
  2. Step 2: Convert to fraction form
    1,279.60/1,919.40 = 355.30/x
  3. Step 3: Cross multiply
    1,279.60x = 1,919.40 × 355.30
  4. Step 4: Simplify right side
    1,279.60x = 681,962.82
  5. Step 5: Solve for x
    x = 681,962.82/1,279.60
  6. Step 6: Final answer
    x = 532.95

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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.