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Finding the Fourth Proportional to 656.74, 985 and 217.99

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Solution

The fourth proportional to 656.74, 985 and 217.99 is: 326.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.74 : 985 = 217.99 : x
  2. Step 2: Convert to fraction form
    656.74/985 = 217.99/x
  3. Step 3: Cross multiply
    656.74x = 985 × 217.99
  4. Step 4: Simplify right side
    656.74x = 214,720.15
  5. Step 5: Solve for x
    x = 214,720.15/656.74
  6. Step 6: Final answer
    x = 326.95

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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.