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Finding the Fourth Proportional to 211.21, 316.81 and 89.48

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Solution

The fourth proportional to 211.21, 316.81 and 89.48 is: 134.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.21 : 316.81 = 89.48 : x
  2. Step 2: Convert to fraction form
    211.21/316.81 = 89.48/x
  3. Step 3: Cross multiply
    211.21x = 316.81 × 89.48
  4. Step 4: Simplify right side
    211.21x = 28,348.16
  5. Step 5: Solve for x
    x = 28,348.16/211.21
  6. Step 6: Final answer
    x = 134.22

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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.