Home / 1,280.06-1,919.79-414.20

Finding the Fourth Proportional to 1,280.06, 1,919.79 and 414.20

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Solution

The fourth proportional to 1,280.06, 1,919.79 and 414.20 is: 621.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.06 : 1,919.79 = 414.20 : x
  2. Step 2: Convert to fraction form
    1,280.06/1,919.79 = 414.20/x
  3. Step 3: Cross multiply
    1,280.06x = 1,919.79 × 414.20
  4. Step 4: Simplify right side
    1,280.06x = 795,177.02
  5. Step 5: Solve for x
    x = 795,177.02/1,280.06
  6. Step 6: Final answer
    x = 621.20

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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.