Home / 1,279.51-1,761.81-1,121.23

Finding the Fourth Proportional to 1,279.51, 1,761.81 and 1,121.23

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Solution

The fourth proportional to 1,279.51, 1,761.81 and 1,121.23 is: 1,543.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.51 : 1,761.81 = 1,121.23 : x
  2. Step 2: Convert to fraction form
    1,279.51/1,761.81 = 1,121.23/x
  3. Step 3: Cross multiply
    1,279.51x = 1,761.81 × 1,121.23
  4. Step 4: Simplify right side
    1,279.51x = 1,975,394.23
  5. Step 5: Solve for x
    x = 1,975,394.23/1,279.51
  6. Step 6: Final answer
    x = 1,543.87

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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.