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Finding the Fourth Proportional to 2,799.76, 3,863.28 and 1,620.40

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Solution

The fourth proportional to 2,799.76, 3,863.28 and 1,620.40 is: 2,235.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,799.76 : 3,863.28 = 1,620.40 : x
  2. Step 2: Convert to fraction form
    2,799.76/3,863.28 = 1,620.40/x
  3. Step 3: Cross multiply
    2,799.76x = 3,863.28 × 1,620.40
  4. Step 4: Simplify right side
    2,799.76x = 6,260,058.91
  5. Step 5: Solve for x
    x = 6,260,058.91/2,799.76
  6. Step 6: Final answer
    x = 2,235.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.