Home / 1,279.09-1,767.05-1,261.81

Finding the Fourth Proportional to 1,279.09, 1,767.05 and 1,261.81

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Solution

The fourth proportional to 1,279.09, 1,767.05 and 1,261.81 is: 1,743.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.09 : 1,767.05 = 1,261.81 : x
  2. Step 2: Convert to fraction form
    1,279.09/1,767.05 = 1,261.81/x
  3. Step 3: Cross multiply
    1,279.09x = 1,767.05 × 1,261.81
  4. Step 4: Simplify right side
    1,279.09x = 2,229,681.36
  5. Step 5: Solve for x
    x = 2,229,681.36/1,279.09
  6. Step 6: Final answer
    x = 1,743.18

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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.