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Finding the Fourth Proportional to 817.79, 1,128.54 and 481.89

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Solution

The fourth proportional to 817.79, 1,128.54 and 481.89 is: 665.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.79 : 1,128.54 = 481.89 : x
  2. Step 2: Convert to fraction form
    817.79/1,128.54 = 481.89/x
  3. Step 3: Cross multiply
    817.79x = 1,128.54 × 481.89
  4. Step 4: Simplify right side
    817.79x = 543,826.50
  5. Step 5: Solve for x
    x = 543,826.50/817.79
  6. Step 6: Final answer
    x = 665.00

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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.