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Finding the Fourth Proportional to 2,688.92, 4,033.12 and 840.04

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Solution

The fourth proportional to 2,688.92, 4,033.12 and 840.04 is: 1,259.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,688.92 : 4,033.12 = 840.04 : x
  2. Step 2: Convert to fraction form
    2,688.92/4,033.12 = 840.04/x
  3. Step 3: Cross multiply
    2,688.92x = 4,033.12 × 840.04
  4. Step 4: Simplify right side
    2,688.92x = 3,387,982.12
  5. Step 5: Solve for x
    x = 3,387,982.12/2,688.92
  6. Step 6: Final answer
    x = 1,259.98

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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.