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Finding the Fourth Proportional to 211.30, 316.95 and 89.62

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Solution

The fourth proportional to 211.30, 316.95 and 89.62 is: 134.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.30 : 316.95 = 89.62 : x
  2. Step 2: Convert to fraction form
    211.30/316.95 = 89.62/x
  3. Step 3: Cross multiply
    211.30x = 316.95 × 89.62
  4. Step 4: Simplify right side
    211.30x = 28,405.06
  5. Step 5: Solve for x
    x = 28,405.06/211.30
  6. Step 6: Final answer
    x = 134.43

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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.