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Finding the Fourth Proportional to 2,585.76, 3,878.87 and 806.70

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Solution

The fourth proportional to 2,585.76, 3,878.87 and 806.70 is: 1,210.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,585.76 : 3,878.87 = 806.70 : x
  2. Step 2: Convert to fraction form
    2,585.76/3,878.87 = 806.70/x
  3. Step 3: Cross multiply
    2,585.76x = 3,878.87 × 806.70
  4. Step 4: Simplify right side
    2,585.76x = 3,129,084.43
  5. Step 5: Solve for x
    x = 3,129,084.43/2,585.76
  6. Step 6: Final answer
    x = 1,210.12

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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.