Home / 1,279.20-1,767.84-1,112.16

Finding the Fourth Proportional to 1,279.20, 1,767.84 and 1,112.16

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Solution

The fourth proportional to 1,279.20, 1,767.84 and 1,112.16 is: 1,536.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.20 : 1,767.84 = 1,112.16 : x
  2. Step 2: Convert to fraction form
    1,279.20/1,767.84 = 1,112.16/x
  3. Step 3: Cross multiply
    1,279.20x = 1,767.84 × 1,112.16
  4. Step 4: Simplify right side
    1,279.20x = 1,966,120.93
  5. Step 5: Solve for x
    x = 1,966,120.93/1,279.20
  6. Step 6: Final answer
    x = 1,536.99

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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.