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Finding the Fourth Proportional to 656.63, 985.08 and 211.79

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Solution

The fourth proportional to 656.63, 985.08 and 211.79 is: 317.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.63 : 985.08 = 211.79 : x
  2. Step 2: Convert to fraction form
    656.63/985.08 = 211.79/x
  3. Step 3: Cross multiply
    656.63x = 985.08 × 211.79
  4. Step 4: Simplify right side
    656.63x = 208,630.09
  5. Step 5: Solve for x
    x = 208,630.09/656.63
  6. Step 6: Final answer
    x = 317.73

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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.