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Finding the Fourth Proportional to 656.84, 985.14 and 218.09

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Solution

The fourth proportional to 656.84, 985.14 and 218.09 is: 327.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.84 : 985.14 = 218.09 : x
  2. Step 2: Convert to fraction form
    656.84/985.14 = 218.09/x
  3. Step 3: Cross multiply
    656.84x = 985.14 × 218.09
  4. Step 4: Simplify right side
    656.84x = 214,849.18
  5. Step 5: Solve for x
    x = 214,849.18/656.84
  6. Step 6: Final answer
    x = 327.10

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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.