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Finding the Fourth Proportional to 1,571.56, 2,168.68 and 863.40

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Solution

The fourth proportional to 1,571.56, 2,168.68 and 863.40 is: 1,191.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,571.56 : 2,168.68 = 863.40 : x
  2. Step 2: Convert to fraction form
    1,571.56/2,168.68 = 863.40/x
  3. Step 3: Cross multiply
    1,571.56x = 2,168.68 × 863.40
  4. Step 4: Simplify right side
    1,571.56x = 1,872,438.31
  5. Step 5: Solve for x
    x = 1,872,438.31/1,571.56
  6. Step 6: Final answer
    x = 1,191.45

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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.