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Finding the Fourth Proportional to 817.94, 1,128.66 and 677.54

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Solution

The fourth proportional to 817.94, 1,128.66 and 677.54 is: 934.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.94 : 1,128.66 = 677.54 : x
  2. Step 2: Convert to fraction form
    817.94/1,128.66 = 677.54/x
  3. Step 3: Cross multiply
    817.94x = 1,128.66 × 677.54
  4. Step 4: Simplify right side
    817.94x = 764,712.30
  5. Step 5: Solve for x
    x = 764,712.30/817.94
  6. Step 6: Final answer
    x = 934.92

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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.