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Finding the Fourth Proportional to 815.67, 1,126.31 and 554.85

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Solution

The fourth proportional to 815.67, 1,126.31 and 554.85 is: 766.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.67 : 1,126.31 = 554.85 : x
  2. Step 2: Convert to fraction form
    815.67/1,126.31 = 554.85/x
  3. Step 3: Cross multiply
    815.67x = 1,126.31 × 554.85
  4. Step 4: Simplify right side
    815.67x = 624,930.33
  5. Step 5: Solve for x
    x = 624,930.33/815.67
  6. Step 6: Final answer
    x = 766.16

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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.