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Finding the Fourth Proportional to 388.37, 582.54 and 131.87

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Solution

The fourth proportional to 388.37, 582.54 and 131.87 is: 197.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.37 : 582.54 = 131.87 : x
  2. Step 2: Convert to fraction form
    388.37/582.54 = 131.87/x
  3. Step 3: Cross multiply
    388.37x = 582.54 × 131.87
  4. Step 4: Simplify right side
    388.37x = 76,816.64
  5. Step 5: Solve for x
    x = 76,816.64/388.37
  6. Step 6: Final answer
    x = 197.79

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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.