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Finding the Fourth Proportional to 211.88, 318.08 and 130.88

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Solution

The fourth proportional to 211.88, 318.08 and 130.88 is: 196.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.88 : 318.08 = 130.88 : x
  2. Step 2: Convert to fraction form
    211.88/318.08 = 130.88/x
  3. Step 3: Cross multiply
    211.88x = 318.08 × 130.88
  4. Step 4: Simplify right side
    211.88x = 41,630.31
  5. Step 5: Solve for x
    x = 41,630.31/211.88
  6. Step 6: Final answer
    x = 196.48

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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.