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Finding the Fourth Proportional to 394.47, 591.78 and 188.90

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Solution

The fourth proportional to 394.47, 591.78 and 188.90 is: 283.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.47 : 591.78 = 188.90 : x
  2. Step 2: Convert to fraction form
    394.47/591.78 = 188.90/x
  3. Step 3: Cross multiply
    394.47x = 591.78 × 188.90
  4. Step 4: Simplify right side
    394.47x = 111,784.28
  5. Step 5: Solve for x
    x = 111,784.28/394.47
  6. Step 6: Final answer
    x = 283.38

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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.