Home / 1,279.32-1,918.20-401.59

Finding the Fourth Proportional to 1,279.32, 1,918.20 and 401.59

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Solution

The fourth proportional to 1,279.32, 1,918.20 and 401.59 is: 602.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.32 : 1,918.20 = 401.59 : x
  2. Step 2: Convert to fraction form
    1,279.32/1,918.20 = 401.59/x
  3. Step 3: Cross multiply
    1,279.32x = 1,918.20 × 401.59
  4. Step 4: Simplify right side
    1,279.32x = 770,329.94
  5. Step 5: Solve for x
    x = 770,329.94/1,279.32
  6. Step 6: Final answer
    x = 602.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.