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Finding the Fourth Proportional to 394.17, 590.83 and 257.31

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Solution

The fourth proportional to 394.17, 590.83 and 257.31 is: 385.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.17 : 590.83 = 257.31 : x
  2. Step 2: Convert to fraction form
    394.17/590.83 = 257.31/x
  3. Step 3: Cross multiply
    394.17x = 590.83 × 257.31
  4. Step 4: Simplify right side
    394.17x = 152,025.82
  5. Step 5: Solve for x
    x = 152,025.82/394.17
  6. Step 6: Final answer
    x = 385.69

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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.