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Finding the Fourth Proportional to 392.07, 587.64 and 218.64

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Solution

The fourth proportional to 392.07, 587.64 and 218.64 is: 327.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.07 : 587.64 = 218.64 : x
  2. Step 2: Convert to fraction form
    392.07/587.64 = 218.64/x
  3. Step 3: Cross multiply
    392.07x = 587.64 × 218.64
  4. Step 4: Simplify right side
    392.07x = 128,481.61
  5. Step 5: Solve for x
    x = 128,481.61/392.07
  6. Step 6: Final answer
    x = 327.70

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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.