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Finding the Fourth Proportional to 258.89, 357.45 and 212.81

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Solution

The fourth proportional to 258.89, 357.45 and 212.81 is: 293.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.89 : 357.45 = 212.81 : x
  2. Step 2: Convert to fraction form
    258.89/357.45 = 212.81/x
  3. Step 3: Cross multiply
    258.89x = 357.45 × 212.81
  4. Step 4: Simplify right side
    258.89x = 76,068.93
  5. Step 5: Solve for x
    x = 76,068.93/258.89
  6. Step 6: Final answer
    x = 293.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.