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Finding the Fourth Proportional to 818.37, 1,129.15 and 553.30

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Solution

The fourth proportional to 818.37, 1,129.15 and 553.30 is: 763.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.37 : 1,129.15 = 553.30 : x
  2. Step 2: Convert to fraction form
    818.37/1,129.15 = 553.30/x
  3. Step 3: Cross multiply
    818.37x = 1,129.15 × 553.30
  4. Step 4: Simplify right side
    818.37x = 624,755.93
  5. Step 5: Solve for x
    x = 624,755.93/818.37
  6. Step 6: Final answer
    x = 763.42

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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.