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Finding the Fourth Proportional to 394.90, 592.39 and 120.99

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Solution

The fourth proportional to 394.90, 592.39 and 120.99 is: 181.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.90 : 592.39 = 120.99 : x
  2. Step 2: Convert to fraction form
    394.90/592.39 = 120.99/x
  3. Step 3: Cross multiply
    394.90x = 592.39 × 120.99
  4. Step 4: Simplify right side
    394.90x = 71,673.27
  5. Step 5: Solve for x
    x = 71,673.27/394.90
  6. Step 6: Final answer
    x = 181.50

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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.