Home / 1,278.83-1,766.91-1,137.70

Finding the Fourth Proportional to 1,278.83, 1,766.91 and 1,137.70

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Solution

The fourth proportional to 1,278.83, 1,766.91 and 1,137.70 is: 1,571.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.83 : 1,766.91 = 1,137.70 : x
  2. Step 2: Convert to fraction form
    1,278.83/1,766.91 = 1,137.70/x
  3. Step 3: Cross multiply
    1,278.83x = 1,766.91 × 1,137.70
  4. Step 4: Simplify right side
    1,278.83x = 2,010,204.67
  5. Step 5: Solve for x
    x = 2,010,204.67/1,278.83
  6. Step 6: Final answer
    x = 1,571.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.