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Finding the Fourth Proportional to 1,571.54, 2,168.68 and 908.60

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Solution

The fourth proportional to 1,571.54, 2,168.68 and 908.60 is: 1,253.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,571.54 : 2,168.68 = 908.60 : x
  2. Step 2: Convert to fraction form
    1,571.54/2,168.68 = 908.60/x
  3. Step 3: Cross multiply
    1,571.54x = 2,168.68 × 908.60
  4. Step 4: Simplify right side
    1,571.54x = 1,970,451.80
  5. Step 5: Solve for x
    x = 1,970,451.80/1,571.54
  6. Step 6: Final answer
    x = 1,253.84

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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.