Home / 1,279.83-1,767.92-1,085.43

Finding the Fourth Proportional to 1,279.83, 1,767.92 and 1,085.43

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Solution

The fourth proportional to 1,279.83, 1,767.92 and 1,085.43 is: 1,499.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.83 : 1,767.92 = 1,085.43 : x
  2. Step 2: Convert to fraction form
    1,279.83/1,767.92 = 1,085.43/x
  3. Step 3: Cross multiply
    1,279.83x = 1,767.92 × 1,085.43
  4. Step 4: Simplify right side
    1,279.83x = 1,918,947.98
  5. Step 5: Solve for x
    x = 1,918,947.98/1,279.83
  6. Step 6: Final answer
    x = 1,499.38

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1.5x scale

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.