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Finding the Fourth Proportional to 393.12, 589.30 and 187.63

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Solution

The fourth proportional to 393.12, 589.30 and 187.63 is: 281.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.12 : 589.30 = 187.63 : x
  2. Step 2: Convert to fraction form
    393.12/589.30 = 187.63/x
  3. Step 3: Cross multiply
    393.12x = 589.30 × 187.63
  4. Step 4: Simplify right side
    393.12x = 110,571.73
  5. Step 5: Solve for x
    x = 110,571.73/393.12
  6. Step 6: Final answer
    x = 281.27

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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.