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Finding the Fourth Proportional to 212.38, 317.85 and 120.94

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Solution

The fourth proportional to 212.38, 317.85 and 120.94 is: 181.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.38 : 317.85 = 120.94 : x
  2. Step 2: Convert to fraction form
    212.38/317.85 = 120.94/x
  3. Step 3: Cross multiply
    212.38x = 317.85 × 120.94
  4. Step 4: Simplify right side
    212.38x = 38,439.53
  5. Step 5: Solve for x
    x = 38,439.53/212.38
  6. Step 6: Final answer
    x = 181.00

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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.