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Finding the Fourth Proportional to 1,571.28, 2,168.34 and 872.70

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Solution

The fourth proportional to 1,571.28, 2,168.34 and 872.70 is: 1,204.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,571.28 : 2,168.34 = 872.70 : x
  2. Step 2: Convert to fraction form
    1,571.28/2,168.34 = 872.70/x
  3. Step 3: Cross multiply
    1,571.28x = 2,168.34 × 872.70
  4. Step 4: Simplify right side
    1,571.28x = 1,892,310.32
  5. Step 5: Solve for x
    x = 1,892,310.32/1,571.28
  6. Step 6: Final answer
    x = 1,204.31

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1.5x scale

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.