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Finding the Fourth Proportional to 818.07, 1,128.43 and 486.43

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Solution

The fourth proportional to 818.07, 1,128.43 and 486.43 is: 670.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.07 : 1,128.43 = 486.43 : x
  2. Step 2: Convert to fraction form
    818.07/1,128.43 = 486.43/x
  3. Step 3: Cross multiply
    818.07x = 1,128.43 × 486.43
  4. Step 4: Simplify right side
    818.07x = 548,902.20
  5. Step 5: Solve for x
    x = 548,902.20/818.07
  6. Step 6: Final answer
    x = 670.97

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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.