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Finding the Fourth Proportional to 815.75, 1,223.66 and 230.79

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Solution

The fourth proportional to 815.75, 1,223.66 and 230.79 is: 346.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.75 : 1,223.66 = 230.79 : x
  2. Step 2: Convert to fraction form
    815.75/1,223.66 = 230.79/x
  3. Step 3: Cross multiply
    815.75x = 1,223.66 × 230.79
  4. Step 4: Simplify right side
    815.75x = 282,407.34
  5. Step 5: Solve for x
    x = 282,407.34/815.75
  6. Step 6: Final answer
    x = 346.20

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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.