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Finding the Fourth Proportional to 2,689.08, 4,034.09 and 840.12

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Solution

The fourth proportional to 2,689.08, 4,034.09 and 840.12 is: 1,260.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,689.08 : 4,034.09 = 840.12 : x
  2. Step 2: Convert to fraction form
    2,689.08/4,034.09 = 840.12/x
  3. Step 3: Cross multiply
    2,689.08x = 4,034.09 × 840.12
  4. Step 4: Simplify right side
    2,689.08x = 3,389,095.32
  5. Step 5: Solve for x
    x = 3,389,095.32/2,689.08
  6. Step 6: Final answer
    x = 1,260.32

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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.