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Finding the Fourth Proportional to 817.33, 1,128.05 and 485.77

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Solution

The fourth proportional to 817.33, 1,128.05 and 485.77 is: 670.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.33 : 1,128.05 = 485.77 : x
  2. Step 2: Convert to fraction form
    817.33/1,128.05 = 485.77/x
  3. Step 3: Cross multiply
    817.33x = 1,128.05 × 485.77
  4. Step 4: Simplify right side
    817.33x = 547,972.85
  5. Step 5: Solve for x
    x = 547,972.85/817.33
  6. Step 6: Final answer
    x = 670.44

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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.