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Finding the Fourth Proportional to 2,095.31, 3,143.07 and 779.40

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Solution

The fourth proportional to 2,095.31, 3,143.07 and 779.40 is: 1,169.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,095.31 : 3,143.07 = 779.40 : x
  2. Step 2: Convert to fraction form
    2,095.31/3,143.07 = 779.40/x
  3. Step 3: Cross multiply
    2,095.31x = 3,143.07 × 779.40
  4. Step 4: Simplify right side
    2,095.31x = 2,449,721.45
  5. Step 5: Solve for x
    x = 2,449,721.45/2,095.31
  6. Step 6: Final answer
    x = 1,169.15

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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.