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Finding the Fourth Proportional to 2,078.16, 3,116.28 and 779.28

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Solution

The fourth proportional to 2,078.16, 3,116.28 and 779.28 is: 1,168.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,078.16 : 3,116.28 = 779.28 : x
  2. Step 2: Convert to fraction form
    2,078.16/3,116.28 = 779.28/x
  3. Step 3: Cross multiply
    2,078.16x = 3,116.28 × 779.28
  4. Step 4: Simplify right side
    2,078.16x = 2,428,454.68
  5. Step 5: Solve for x
    x = 2,428,454.68/2,078.16
  6. Step 6: Final answer
    x = 1,168.56

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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.