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Finding the Fourth Proportional to 1,571.57, 2,168.79 and 872.99

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Solution

The fourth proportional to 1,571.57, 2,168.79 and 872.99 is: 1,204.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,571.57 : 2,168.79 = 872.99 : x
  2. Step 2: Convert to fraction form
    1,571.57/2,168.79 = 872.99/x
  3. Step 3: Cross multiply
    1,571.57x = 2,168.79 × 872.99
  4. Step 4: Simplify right side
    1,571.57x = 1,893,331.98
  5. Step 5: Solve for x
    x = 1,893,331.98/1,571.57
  6. Step 6: Final answer
    x = 1,204.74

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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.