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Finding the Fourth Proportional to 818.22, 1,128.84 and 556.56

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Solution

The fourth proportional to 818.22, 1,128.84 and 556.56 is: 767.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.22 : 1,128.84 = 556.56 : x
  2. Step 2: Convert to fraction form
    818.22/1,128.84 = 556.56/x
  3. Step 3: Cross multiply
    818.22x = 1,128.84 × 556.56
  4. Step 4: Simplify right side
    818.22x = 628,267.19
  5. Step 5: Solve for x
    x = 628,267.19/818.22
  6. Step 6: Final answer
    x = 767.85

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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.