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Finding the Fourth Proportional to 388.45, 582.31 and 144.91

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Solution

The fourth proportional to 388.45, 582.31 and 144.91 is: 217.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.45 : 582.31 = 144.91 : x
  2. Step 2: Convert to fraction form
    388.45/582.31 = 144.91/x
  3. Step 3: Cross multiply
    388.45x = 582.31 × 144.91
  4. Step 4: Simplify right side
    388.45x = 84,382.54
  5. Step 5: Solve for x
    x = 84,382.54/388.45
  6. Step 6: Final answer
    x = 217.23

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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.