Home / 1,280.49-1,919.50-414.20

Finding the Fourth Proportional to 1,280.49, 1,919.50 and 414.20

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Solution

The fourth proportional to 1,280.49, 1,919.50 and 414.20 is: 620.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.49 : 1,919.50 = 414.20 : x
  2. Step 2: Convert to fraction form
    1,280.49/1,919.50 = 414.20/x
  3. Step 3: Cross multiply
    1,280.49x = 1,919.50 × 414.20
  4. Step 4: Simplify right side
    1,280.49x = 795,056.90
  5. Step 5: Solve for x
    x = 795,056.90/1,280.49
  6. Step 6: Final answer
    x = 620.90

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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.