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Finding the Fourth Proportional to 2,139.08, 3,207.24 and 840.68

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Solution

The fourth proportional to 2,139.08, 3,207.24 and 840.68 is: 1,260.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.08 : 3,207.24 = 840.68 : x
  2. Step 2: Convert to fraction form
    2,139.08/3,207.24 = 840.68/x
  3. Step 3: Cross multiply
    2,139.08x = 3,207.24 × 840.68
  4. Step 4: Simplify right side
    2,139.08x = 2,696,262.52
  5. Step 5: Solve for x
    x = 2,696,262.52/2,139.08
  6. Step 6: Final answer
    x = 1,260.48

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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.