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Finding the Fourth Proportional to 817.98, 1,226.04 and 407.40

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Solution

The fourth proportional to 817.98, 1,226.04 and 407.40 is: 610.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.98 : 1,226.04 = 407.40 : x
  2. Step 2: Convert to fraction form
    817.98/1,226.04 = 407.40/x
  3. Step 3: Cross multiply
    817.98x = 1,226.04 × 407.40
  4. Step 4: Simplify right side
    817.98x = 499,488.70
  5. Step 5: Solve for x
    x = 499,488.70/817.98
  6. Step 6: Final answer
    x = 610.64

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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.