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Finding the Fourth Proportional to 393.20, 589.74 and 277.28

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Solution

The fourth proportional to 393.20, 589.74 and 277.28 is: 415.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.20 : 589.74 = 277.28 : x
  2. Step 2: Convert to fraction form
    393.20/589.74 = 277.28/x
  3. Step 3: Cross multiply
    393.20x = 589.74 × 277.28
  4. Step 4: Simplify right side
    393.20x = 163,523.11
  5. Step 5: Solve for x
    x = 163,523.11/393.20
  6. Step 6: Final answer
    x = 415.88

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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.