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Finding the Fourth Proportional to 393.89, 590.70 and 119.99

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Solution

The fourth proportional to 393.89, 590.70 and 119.99 is: 179.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.89 : 590.70 = 119.99 : x
  2. Step 2: Convert to fraction form
    393.89/590.70 = 119.99/x
  3. Step 3: Cross multiply
    393.89x = 590.70 × 119.99
  4. Step 4: Simplify right side
    393.89x = 70,875.14
  5. Step 5: Solve for x
    x = 70,875.14/393.89
  6. Step 6: Final answer
    x = 179.94

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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.