Home / 2,811.12-4,216.80-1,272

Finding the Fourth Proportional to 2,811.12, 4,216.80 and 1,272

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Solution

The fourth proportional to 2,811.12, 4,216.80 and 1,272 is: 1,908.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.12 : 4,216.80 = 1,272 : x
  2. Step 2: Convert to fraction form
    2,811.12/4,216.80 = 1,272/x
  3. Step 3: Cross multiply
    2,811.12x = 4,216.80 × 1,272
  4. Step 4: Simplify right side
    2,811.12x = 5,363,769.60
  5. Step 5: Solve for x
    x = 5,363,769.60/2,811.12
  6. Step 6: Final answer
    x = 1,908.05

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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.