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Finding the Fourth Proportional to 392, 587.87 and 172.56

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Solution

The fourth proportional to 392, 587.87 and 172.56 is: 258.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    392 : 587.87 = 172.56 : x
  2. Step 2: Convert to fraction form
    392/587.87 = 172.56/x
  3. Step 3: Cross multiply
    392x = 587.87 × 172.56
  4. Step 4: Simplify right side
    392x = 101,441.98
  5. Step 5: Solve for x
    x = 101,441.98/392
  6. Step 6: Final answer
    x = 258.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.