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Finding the Fourth Proportional to 657.39, 986.14 and 218.55

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Solution

The fourth proportional to 657.39, 986.14 and 218.55 is: 327.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.39 : 986.14 = 218.55 : x
  2. Step 2: Convert to fraction form
    657.39/986.14 = 218.55/x
  3. Step 3: Cross multiply
    657.39x = 986.14 × 218.55
  4. Step 4: Simplify right side
    657.39x = 215,520.90
  5. Step 5: Solve for x
    x = 215,520.90/657.39
  6. Step 6: Final answer
    x = 327.84

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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.