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Finding the Fourth Proportional to 212.81, 318.93 and 121.43

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Solution

The fourth proportional to 212.81, 318.93 and 121.43 is: 181.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.81 : 318.93 = 121.43 : x
  2. Step 2: Convert to fraction form
    212.81/318.93 = 121.43/x
  3. Step 3: Cross multiply
    212.81x = 318.93 × 121.43
  4. Step 4: Simplify right side
    212.81x = 38,727.67
  5. Step 5: Solve for x
    x = 38,727.67/212.81
  6. Step 6: Final answer
    x = 181.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.