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Finding the Fourth Proportional to 2,640.29, 3,961.32 and 885.47

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Solution

The fourth proportional to 2,640.29, 3,961.32 and 885.47 is: 1,328.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.29 : 3,961.32 = 885.47 : x
  2. Step 2: Convert to fraction form
    2,640.29/3,961.32 = 885.47/x
  3. Step 3: Cross multiply
    2,640.29x = 3,961.32 × 885.47
  4. Step 4: Simplify right side
    2,640.29x = 3,507,621.75
  5. Step 5: Solve for x
    x = 3,507,621.75/2,640.29
  6. Step 6: Final answer
    x = 1,328.50

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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.