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Finding the Fourth Proportional to 211.09, 316.65 and 108.35

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Solution

The fourth proportional to 211.09, 316.65 and 108.35 is: 162.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.09 : 316.65 = 108.35 : x
  2. Step 2: Convert to fraction form
    211.09/316.65 = 108.35/x
  3. Step 3: Cross multiply
    211.09x = 316.65 × 108.35
  4. Step 4: Simplify right side
    211.09x = 34,309.03
  5. Step 5: Solve for x
    x = 34,309.03/211.09
  6. Step 6: Final answer
    x = 162.53

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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.