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Finding the Fourth Proportional to 393.60, 589.34 and 256.31

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Solution

The fourth proportional to 393.60, 589.34 and 256.31 is: 383.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.60 : 589.34 = 256.31 : x
  2. Step 2: Convert to fraction form
    393.60/589.34 = 256.31/x
  3. Step 3: Cross multiply
    393.60x = 589.34 × 256.31
  4. Step 4: Simplify right side
    393.60x = 151,049.51
  5. Step 5: Solve for x
    x = 151,049.51/393.60
  6. Step 6: Final answer
    x = 383.76

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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.