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Finding the Fourth Proportional to 393.19, 589.80 and 187.78

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Solution

The fourth proportional to 393.19, 589.80 and 187.78 is: 281.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.19 : 589.80 = 187.78 : x
  2. Step 2: Convert to fraction form
    393.19/589.80 = 187.78/x
  3. Step 3: Cross multiply
    393.19x = 589.80 × 187.78
  4. Step 4: Simplify right side
    393.19x = 110,752.64
  5. Step 5: Solve for x
    x = 110,752.64/393.19
  6. Step 6: Final answer
    x = 281.68

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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.