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Finding the Fourth Proportional to 911.98, 1,368.30 and 449.72

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Solution

The fourth proportional to 911.98, 1,368.30 and 449.72 is: 674.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.98 : 1,368.30 = 449.72 : x
  2. Step 2: Convert to fraction form
    911.98/1,368.30 = 449.72/x
  3. Step 3: Cross multiply
    911.98x = 1,368.30 × 449.72
  4. Step 4: Simplify right side
    911.98x = 615,351.88
  5. Step 5: Solve for x
    x = 615,351.88/911.98
  6. Step 6: Final answer
    x = 674.74

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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.