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Finding the Fourth Proportional to 815.34, 1,125.26 and 553.89

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Solution

The fourth proportional to 815.34, 1,125.26 and 553.89 is: 764.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.34 : 1,125.26 = 553.89 : x
  2. Step 2: Convert to fraction form
    815.34/1,125.26 = 553.89/x
  3. Step 3: Cross multiply
    815.34x = 1,125.26 × 553.89
  4. Step 4: Simplify right side
    815.34x = 623,270.26
  5. Step 5: Solve for x
    x = 623,270.26/815.34
  6. Step 6: Final answer
    x = 764.43

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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.