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Finding the Fourth Proportional to 657.42, 986.01 and 218.62

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Solution

The fourth proportional to 657.42, 986.01 and 218.62 is: 327.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.42 : 986.01 = 218.62 : x
  2. Step 2: Convert to fraction form
    657.42/986.01 = 218.62/x
  3. Step 3: Cross multiply
    657.42x = 986.01 × 218.62
  4. Step 4: Simplify right side
    657.42x = 215,564.18
  5. Step 5: Solve for x
    x = 215,564.18/657.42
  6. Step 6: Final answer
    x = 327.90

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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.