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Finding the Fourth Proportional to 2,411.80, 3,617.72 and 872.80

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Solution

The fourth proportional to 2,411.80, 3,617.72 and 872.80 is: 1,309.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,411.80 : 3,617.72 = 872.80 : x
  2. Step 2: Convert to fraction form
    2,411.80/3,617.72 = 872.80/x
  3. Step 3: Cross multiply
    2,411.80x = 3,617.72 × 872.80
  4. Step 4: Simplify right side
    2,411.80x = 3,157,546.02
  5. Step 5: Solve for x
    x = 3,157,546.02/2,411.80
  6. Step 6: Final answer
    x = 1,309.21

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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.