Home / 1,516.80-2,275.20-1,279.20

Finding the Fourth Proportional to 1,516.80, 2,275.20 and 1,279.20

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Solution

The fourth proportional to 1,516.80, 2,275.20 and 1,279.20 is: 1,918.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,516.80 : 2,275.20 = 1,279.20 : x
  2. Step 2: Convert to fraction form
    1,516.80/2,275.20 = 1,279.20/x
  3. Step 3: Cross multiply
    1,516.80x = 2,275.20 × 1,279.20
  4. Step 4: Simplify right side
    1,516.80x = 2,910,435.84
  5. Step 5: Solve for x
    x = 2,910,435.84/1,516.80
  6. Step 6: Final answer
    x = 1,918.80

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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.