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Finding the Fourth Proportional to 817.78, 1,128.44 and 486.29

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Solution

The fourth proportional to 817.78, 1,128.44 and 486.29 is: 671.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.78 : 1,128.44 = 486.29 : x
  2. Step 2: Convert to fraction form
    817.78/1,128.44 = 486.29/x
  3. Step 3: Cross multiply
    817.78x = 1,128.44 × 486.29
  4. Step 4: Simplify right side
    817.78x = 548,749.09
  5. Step 5: Solve for x
    x = 548,749.09/817.78
  6. Step 6: Final answer
    x = 671.02

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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.