Home / 1,279.89-1,919.70-355.55

Finding the Fourth Proportional to 1,279.89, 1,919.70 and 355.55

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Solution

The fourth proportional to 1,279.89, 1,919.70 and 355.55 is: 533.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.89 : 1,919.70 = 355.55 : x
  2. Step 2: Convert to fraction form
    1,279.89/1,919.70 = 355.55/x
  3. Step 3: Cross multiply
    1,279.89x = 1,919.70 × 355.55
  4. Step 4: Simplify right side
    1,279.89x = 682,539.74
  5. Step 5: Solve for x
    x = 682,539.74/1,279.89
  6. Step 6: Final answer
    x = 533.28

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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.