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Finding the Fourth Proportional to 2,172.71, 2,998.26 and 1,287.99

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Solution

The fourth proportional to 2,172.71, 2,998.26 and 1,287.99 is: 1,777.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.71 : 2,998.26 = 1,287.99 : x
  2. Step 2: Convert to fraction form
    2,172.71/2,998.26 = 1,287.99/x
  3. Step 3: Cross multiply
    2,172.71x = 2,998.26 × 1,287.99
  4. Step 4: Simplify right side
    2,172.71x = 3,861,728.90
  5. Step 5: Solve for x
    x = 3,861,728.90/2,172.71
  6. Step 6: Final answer
    x = 1,777.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.