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Finding the Fourth Proportional to 2,688.86, 4,033.70 and 840.12

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Solution

The fourth proportional to 2,688.86, 4,033.70 and 840.12 is: 1,260.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,688.86 : 4,033.70 = 840.12 : x
  2. Step 2: Convert to fraction form
    2,688.86/4,033.70 = 840.12/x
  3. Step 3: Cross multiply
    2,688.86x = 4,033.70 × 840.12
  4. Step 4: Simplify right side
    2,688.86x = 3,388,787.84
  5. Step 5: Solve for x
    x = 3,388,787.84/2,688.86
  6. Step 6: Final answer
    x = 1,260.31

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1.5x scale

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.