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Finding the Fourth Proportional to 656.87, 985.07 and 218.01

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Solution

The fourth proportional to 656.87, 985.07 and 218.01 is: 326.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.87 : 985.07 = 218.01 : x
  2. Step 2: Convert to fraction form
    656.87/985.07 = 218.01/x
  3. Step 3: Cross multiply
    656.87x = 985.07 × 218.01
  4. Step 4: Simplify right side
    656.87x = 214,754.02
  5. Step 5: Solve for x
    x = 214,754.02/656.87
  6. Step 6: Final answer
    x = 326.94

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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.