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Finding the Fourth Proportional to 211.51, 316.96 and 139.22

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Solution

The fourth proportional to 211.51, 316.96 and 139.22 is: 208.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.51 : 316.96 = 139.22 : x
  2. Step 2: Convert to fraction form
    211.51/316.96 = 139.22/x
  3. Step 3: Cross multiply
    211.51x = 316.96 × 139.22
  4. Step 4: Simplify right side
    211.51x = 44,127.21
  5. Step 5: Solve for x
    x = 44,127.21/211.51
  6. Step 6: Final answer
    x = 208.63

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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.