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Finding the Fourth Proportional to 817.57, 1,226.85 and 355.36

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Solution

The fourth proportional to 817.57, 1,226.85 and 355.36 is: 533.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.57 : 1,226.85 = 355.36 : x
  2. Step 2: Convert to fraction form
    817.57/1,226.85 = 355.36/x
  3. Step 3: Cross multiply
    817.57x = 1,226.85 × 355.36
  4. Step 4: Simplify right side
    817.57x = 435,974.77
  5. Step 5: Solve for x
    x = 435,974.77/817.57
  6. Step 6: Final answer
    x = 533.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.