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Finding the Fourth Proportional to 214.89, 318.75 and 211.65

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Solution

The fourth proportional to 214.89, 318.75 and 211.65 is: 313.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.89 : 318.75 = 211.65 : x
  2. Step 2: Convert to fraction form
    214.89/318.75 = 211.65/x
  3. Step 3: Cross multiply
    214.89x = 318.75 × 211.65
  4. Step 4: Simplify right side
    214.89x = 67,463.44
  5. Step 5: Solve for x
    x = 67,463.44/214.89
  6. Step 6: Final answer
    x = 313.94

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.