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Finding the Fourth Proportional to 815.44, 1,126.23 and 553.00

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Solution

The fourth proportional to 815.44, 1,126.23 and 553.00 is: 763.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.44 : 1,126.23 = 553.00 : x
  2. Step 2: Convert to fraction form
    815.44/1,126.23 = 553.00/x
  3. Step 3: Cross multiply
    815.44x = 1,126.23 × 553.00
  4. Step 4: Simplify right side
    815.44x = 622,804.45
  5. Step 5: Solve for x
    x = 622,804.45/815.44
  6. Step 6: Final answer
    x = 763.77

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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.