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Finding the Fourth Proportional to 211.95, 318.24 and 131.13

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Solution

The fourth proportional to 211.95, 318.24 and 131.13 is: 196.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.95 : 318.24 = 131.13 : x
  2. Step 2: Convert to fraction form
    211.95/318.24 = 131.13/x
  3. Step 3: Cross multiply
    211.95x = 318.24 × 131.13
  4. Step 4: Simplify right side
    211.95x = 41,730.81
  5. Step 5: Solve for x
    x = 41,730.81/211.95
  6. Step 6: Final answer
    x = 196.89

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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.