Home / 1,279.64-1,919.66-457.71

Finding the Fourth Proportional to 1,279.64, 1,919.66 and 457.71

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Solution

The fourth proportional to 1,279.64, 1,919.66 and 457.71 is: 686.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.64 : 1,919.66 = 457.71 : x
  2. Step 2: Convert to fraction form
    1,279.64/1,919.66 = 457.71/x
  3. Step 3: Cross multiply
    1,279.64x = 1,919.66 × 457.71
  4. Step 4: Simplify right side
    1,279.64x = 878,645.29
  5. Step 5: Solve for x
    x = 878,645.29/1,279.64
  6. Step 6: Final answer
    x = 686.64

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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.