Home / 2,811.52-4,216.96-1,272

Finding the Fourth Proportional to 2,811.52, 4,216.96 and 1,272

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Solution

The fourth proportional to 2,811.52, 4,216.96 and 1,272 is: 1,907.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.52 : 4,216.96 = 1,272 : x
  2. Step 2: Convert to fraction form
    2,811.52/4,216.96 = 1,272/x
  3. Step 3: Cross multiply
    2,811.52x = 4,216.96 × 1,272
  4. Step 4: Simplify right side
    2,811.52x = 5,363,973.12
  5. Step 5: Solve for x
    x = 5,363,973.12/2,811.52
  6. Step 6: Final answer
    x = 1,907.86

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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.