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Finding the Fourth Proportional to 657.73, 986.69 and 218.84

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Solution

The fourth proportional to 657.73, 986.69 and 218.84 is: 328.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.73 : 986.69 = 218.84 : x
  2. Step 2: Convert to fraction form
    657.73/986.69 = 218.84/x
  3. Step 3: Cross multiply
    657.73x = 986.69 × 218.84
  4. Step 4: Simplify right side
    657.73x = 215,921.62
  5. Step 5: Solve for x
    x = 215,921.62/657.73
  6. Step 6: Final answer
    x = 328.28

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Double scale
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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.