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Finding the Fourth Proportional to 394.45, 591.90 and 189.00

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Solution

The fourth proportional to 394.45, 591.90 and 189.00 is: 283.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.45 : 591.90 = 189.00 : x
  2. Step 2: Convert to fraction form
    394.45/591.90 = 189.00/x
  3. Step 3: Cross multiply
    394.45x = 591.90 × 189.00
  4. Step 4: Simplify right side
    394.45x = 111,865.20
  5. Step 5: Solve for x
    x = 111,865.20/394.45
  6. Step 6: Final answer
    x = 283.60

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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.