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Finding the Fourth Proportional to 817.91, 1,128.28 and 518.62

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Solution

The fourth proportional to 817.91, 1,128.28 and 518.62 is: 715.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.91 : 1,128.28 = 518.62 : x
  2. Step 2: Convert to fraction form
    817.91/1,128.28 = 518.62/x
  3. Step 3: Cross multiply
    817.91x = 1,128.28 × 518.62
  4. Step 4: Simplify right side
    817.91x = 585,147.54
  5. Step 5: Solve for x
    x = 585,147.54/817.91
  6. Step 6: Final answer
    x = 715.41

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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.