Home / 1,279.36-1,919.27-458.11

Finding the Fourth Proportional to 1,279.36, 1,919.27 and 458.11

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Solution

The fourth proportional to 1,279.36, 1,919.27 and 458.11 is: 687.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.36 : 1,919.27 = 458.11 : x
  2. Step 2: Convert to fraction form
    1,279.36/1,919.27 = 458.11/x
  3. Step 3: Cross multiply
    1,279.36x = 1,919.27 × 458.11
  4. Step 4: Simplify right side
    1,279.36x = 879,236.78
  5. Step 5: Solve for x
    x = 879,236.78/1,279.36
  6. Step 6: Final answer
    x = 687.25

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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.