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Finding the Fourth Proportional to 815.85, 1,124.75 and 553.41

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Solution

The fourth proportional to 815.85, 1,124.75 and 553.41 is: 762.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.85 : 1,124.75 = 553.41 : x
  2. Step 2: Convert to fraction form
    815.85/1,124.75 = 553.41/x
  3. Step 3: Cross multiply
    815.85x = 1,124.75 × 553.41
  4. Step 4: Simplify right side
    815.85x = 622,445.13
  5. Step 5: Solve for x
    x = 622,445.13/815.85
  6. Step 6: Final answer
    x = 762.94

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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.