Home / 1,278.75-1,919.49-630.85

Finding the Fourth Proportional to 1,278.75, 1,919.49 and 630.85

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Solution

The fourth proportional to 1,278.75, 1,919.49 and 630.85 is: 946.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.75 : 1,919.49 = 630.85 : x
  2. Step 2: Convert to fraction form
    1,278.75/1,919.49 = 630.85/x
  3. Step 3: Cross multiply
    1,278.75x = 1,919.49 × 630.85
  4. Step 4: Simplify right side
    1,278.75x = 1,210,910.27
  5. Step 5: Solve for x
    x = 1,210,910.27/1,278.75
  6. Step 6: Final answer
    x = 946.95

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1.5x scale

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.