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Finding the Fourth Proportional to 818.09, 1,129.20 and 538.54

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Solution

The fourth proportional to 818.09, 1,129.20 and 538.54 is: 743.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.09 : 1,129.20 = 538.54 : x
  2. Step 2: Convert to fraction form
    818.09/1,129.20 = 538.54/x
  3. Step 3: Cross multiply
    818.09x = 1,129.20 × 538.54
  4. Step 4: Simplify right side
    818.09x = 608,119.37
  5. Step 5: Solve for x
    x = 608,119.37/818.09
  6. Step 6: Final answer
    x = 743.34

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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.