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Finding the Fourth Proportional to 815.38, 1,223.13 and 238.25

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Solution

The fourth proportional to 815.38, 1,223.13 and 238.25 is: 357.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.38 : 1,223.13 = 238.25 : x
  2. Step 2: Convert to fraction form
    815.38/1,223.13 = 238.25/x
  3. Step 3: Cross multiply
    815.38x = 1,223.13 × 238.25
  4. Step 4: Simplify right side
    815.38x = 291,410.72
  5. Step 5: Solve for x
    x = 291,410.72/815.38
  6. Step 6: Final answer
    x = 357.39

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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.