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Finding the Fourth Proportional to 394.34, 591.10 and 257.45

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Solution

The fourth proportional to 394.34, 591.10 and 257.45 is: 385.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.34 : 591.10 = 257.45 : x
  2. Step 2: Convert to fraction form
    394.34/591.10 = 257.45/x
  3. Step 3: Cross multiply
    394.34x = 591.10 × 257.45
  4. Step 4: Simplify right side
    394.34x = 152,175.10
  5. Step 5: Solve for x
    x = 152,175.10/394.34
  6. Step 6: Final answer
    x = 385.90

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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.