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Finding the Fourth Proportional to 656.63, 985 and 217.87

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Solution

The fourth proportional to 656.63, 985 and 217.87 is: 326.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.63 : 985 = 217.87 : x
  2. Step 2: Convert to fraction form
    656.63/985 = 217.87/x
  3. Step 3: Cross multiply
    656.63x = 985 × 217.87
  4. Step 4: Simplify right side
    656.63x = 214,601.95
  5. Step 5: Solve for x
    x = 214,601.95/656.63
  6. Step 6: Final answer
    x = 326.82

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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.