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Finding the Fourth Proportional to 380.91, 525.64 and 212.89

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Solution

The fourth proportional to 380.91, 525.64 and 212.89 is: 293.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.91 : 525.64 = 212.89 : x
  2. Step 2: Convert to fraction form
    380.91/525.64 = 212.89/x
  3. Step 3: Cross multiply
    380.91x = 525.64 × 212.89
  4. Step 4: Simplify right side
    380.91x = 111,903.50
  5. Step 5: Solve for x
    x = 111,903.50/380.91
  6. Step 6: Final answer
    x = 293.78

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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.