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Finding the Fourth Proportional to 213.23, 318.40 and 211.95

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Solution

The fourth proportional to 213.23, 318.40 and 211.95 is: 316.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.23 : 318.40 = 211.95 : x
  2. Step 2: Convert to fraction form
    213.23/318.40 = 211.95/x
  3. Step 3: Cross multiply
    213.23x = 318.40 × 211.95
  4. Step 4: Simplify right side
    213.23x = 67,483.29
  5. Step 5: Solve for x
    x = 67,483.29/213.23
  6. Step 6: Final answer
    x = 316.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.