Home / 1,279.21-1,918.40-499.16

Finding the Fourth Proportional to 1,279.21, 1,918.40 and 499.16

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Solution

The fourth proportional to 1,279.21, 1,918.40 and 499.16 is: 748.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.21 : 1,918.40 = 499.16 : x
  2. Step 2: Convert to fraction form
    1,279.21/1,918.40 = 499.16/x
  3. Step 3: Cross multiply
    1,279.21x = 1,918.40 × 499.16
  4. Step 4: Simplify right side
    1,279.21x = 957,588.54
  5. Step 5: Solve for x
    x = 957,588.54/1,279.21
  6. Step 6: Final answer
    x = 748.58

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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.