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Finding the Fourth Proportional to 393.93, 591.20 and 256.94

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Solution

The fourth proportional to 393.93, 591.20 and 256.94 is: 385.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.93 : 591.20 = 256.94 : x
  2. Step 2: Convert to fraction form
    393.93/591.20 = 256.94/x
  3. Step 3: Cross multiply
    393.93x = 591.20 × 256.94
  4. Step 4: Simplify right side
    393.93x = 151,901.87
  5. Step 5: Solve for x
    x = 151,901.87/393.93
  6. Step 6: Final answer
    x = 385.61

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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.