Home / 1,515.80-2,273.70-1,272.80

Finding the Fourth Proportional to 1,515.80, 2,273.70 and 1,272.80

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Solution

The fourth proportional to 1,515.80, 2,273.70 and 1,272.80 is: 1,909.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515.80 : 2,273.70 = 1,272.80 : x
  2. Step 2: Convert to fraction form
    1,515.80/2,273.70 = 1,272.80/x
  3. Step 3: Cross multiply
    1,515.80x = 2,273.70 × 1,272.80
  4. Step 4: Simplify right side
    1,515.80x = 2,893,965.36
  5. Step 5: Solve for x
    x = 2,893,965.36/1,515.80
  6. Step 6: Final answer
    x = 1,909.20

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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.