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Finding the Fourth Proportional to 215.74, 321.18 and 212.70

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Solution

The fourth proportional to 215.74, 321.18 and 212.70 is: 316.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.74 : 321.18 = 212.70 : x
  2. Step 2: Convert to fraction form
    215.74/321.18 = 212.70/x
  3. Step 3: Cross multiply
    215.74x = 321.18 × 212.70
  4. Step 4: Simplify right side
    215.74x = 68,314.99
  5. Step 5: Solve for x
    x = 68,314.99/215.74
  6. Step 6: Final answer
    x = 316.65

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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.