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Finding the Fourth Proportional to 2,114.92, 3,172.36 and 815.48

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Solution

The fourth proportional to 2,114.92, 3,172.36 and 815.48 is: 1,223.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,114.92 : 3,172.36 = 815.48 : x
  2. Step 2: Convert to fraction form
    2,114.92/3,172.36 = 815.48/x
  3. Step 3: Cross multiply
    2,114.92x = 3,172.36 × 815.48
  4. Step 4: Simplify right side
    2,114.92x = 2,586,996.13
  5. Step 5: Solve for x
    x = 2,586,996.13/2,114.92
  6. Step 6: Final answer
    x = 1,223.21

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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.