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Finding the Fourth Proportional to 379.40, 523.70 and 317.94

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Solution

The fourth proportional to 379.40, 523.70 and 317.94 is: 438.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.40 : 523.70 = 317.94 : x
  2. Step 2: Convert to fraction form
    379.40/523.70 = 317.94/x
  3. Step 3: Cross multiply
    379.40x = 523.70 × 317.94
  4. Step 4: Simplify right side
    379.40x = 166,503.59
  5. Step 5: Solve for x
    x = 166,503.59/379.40
  6. Step 6: Final answer
    x = 438.87

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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.