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Finding the Fourth Proportional to 817.16, 1,226.88 and 422.12

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Solution

The fourth proportional to 817.16, 1,226.88 and 422.12 is: 633.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.16 : 1,226.88 = 422.12 : x
  2. Step 2: Convert to fraction form
    817.16/1,226.88 = 422.12/x
  3. Step 3: Cross multiply
    817.16x = 1,226.88 × 422.12
  4. Step 4: Simplify right side
    817.16x = 517,890.59
  5. Step 5: Solve for x
    x = 517,890.59/817.16
  6. Step 6: Final answer
    x = 633.77

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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.