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Finding the Fourth Proportional to 657.15, 985.83 and 218.49

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Solution

The fourth proportional to 657.15, 985.83 and 218.49 is: 327.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.15 : 985.83 = 218.49 : x
  2. Step 2: Convert to fraction form
    657.15/985.83 = 218.49/x
  3. Step 3: Cross multiply
    657.15x = 985.83 × 218.49
  4. Step 4: Simplify right side
    657.15x = 215,394.00
  5. Step 5: Solve for x
    x = 215,394.00/657.15
  6. Step 6: Final answer
    x = 327.77

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Similar ratio
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1.5x scale

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.