Home / 1,276.40-1,914.60-410.80

Finding the Fourth Proportional to 1,276.40, 1,914.60 and 410.80

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Solution

The fourth proportional to 1,276.40, 1,914.60 and 410.80 is: 616.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.40 : 1,914.60 = 410.80 : x
  2. Step 2: Convert to fraction form
    1,276.40/1,914.60 = 410.80/x
  3. Step 3: Cross multiply
    1,276.40x = 1,914.60 × 410.80
  4. Step 4: Simplify right side
    1,276.40x = 786,517.68
  5. Step 5: Solve for x
    x = 786,517.68/1,276.40
  6. Step 6: Final answer
    x = 616.20

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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.