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Finding the Fourth Proportional to 815.38, 1,223.07 and 238.21

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Solution

The fourth proportional to 815.38, 1,223.07 and 238.21 is: 357.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.38 : 1,223.07 = 238.21 : x
  2. Step 2: Convert to fraction form
    815.38/1,223.07 = 238.21/x
  3. Step 3: Cross multiply
    815.38x = 1,223.07 × 238.21
  4. Step 4: Simplify right side
    815.38x = 291,347.50
  5. Step 5: Solve for x
    x = 291,347.50/815.38
  6. Step 6: Final answer
    x = 357.32

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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.