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Finding the Fourth Proportional to 3,390.74, 5,078.80 and 2,799.12

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Solution

The fourth proportional to 3,390.74, 5,078.80 and 2,799.12 is: 4,192.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,390.74 : 5,078.80 = 2,799.12 : x
  2. Step 2: Convert to fraction form
    3,390.74/5,078.80 = 2,799.12/x
  3. Step 3: Cross multiply
    3,390.74x = 5,078.80 × 2,799.12
  4. Step 4: Simplify right side
    3,390.74x = 14,216,170.66
  5. Step 5: Solve for x
    x = 14,216,170.66/3,390.74
  6. Step 6: Final answer
    x = 4,192.65

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1.5x scale

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.