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Finding the Fourth Proportional to 388.11, 582.39 and 144.80

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Solution

The fourth proportional to 388.11, 582.39 and 144.80 is: 217.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.11 : 582.39 = 144.80 : x
  2. Step 2: Convert to fraction form
    388.11/582.39 = 144.80/x
  3. Step 3: Cross multiply
    388.11x = 582.39 × 144.80
  4. Step 4: Simplify right side
    388.11x = 84,330.07
  5. Step 5: Solve for x
    x = 84,330.07/388.11
  6. Step 6: Final answer
    x = 217.28

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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.