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Finding the Fourth Proportional to 212.81, 294.03 and 189.28

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Solution

The fourth proportional to 212.81, 294.03 and 189.28 is: 261.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.81 : 294.03 = 189.28 : x
  2. Step 2: Convert to fraction form
    212.81/294.03 = 189.28/x
  3. Step 3: Cross multiply
    212.81x = 294.03 × 189.28
  4. Step 4: Simplify right side
    212.81x = 55,653.79
  5. Step 5: Solve for x
    x = 55,653.79/212.81
  6. Step 6: Final answer
    x = 261.52

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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.