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Finding the Fourth Proportional to 817.19, 1,226.44 and 427.31

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Solution

The fourth proportional to 817.19, 1,226.44 and 427.31 is: 641.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.19 : 1,226.44 = 427.31 : x
  2. Step 2: Convert to fraction form
    817.19/1,226.44 = 427.31/x
  3. Step 3: Cross multiply
    817.19x = 1,226.44 × 427.31
  4. Step 4: Simplify right side
    817.19x = 524,070.08
  5. Step 5: Solve for x
    x = 524,070.08/817.19
  6. Step 6: Final answer
    x = 641.31

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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.