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Finding the Fourth Proportional to 817.63, 1,128.26 and 481.47

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Solution

The fourth proportional to 817.63, 1,128.26 and 481.47 is: 664.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.63 : 1,128.26 = 481.47 : x
  2. Step 2: Convert to fraction form
    817.63/1,128.26 = 481.47/x
  3. Step 3: Cross multiply
    817.63x = 1,128.26 × 481.47
  4. Step 4: Simplify right side
    817.63x = 543,223.34
  5. Step 5: Solve for x
    x = 543,223.34/817.63
  6. Step 6: Final answer
    x = 664.39

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Double scale
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1.5x scale

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.