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Finding the Fourth Proportional to 654.89, 980.91 and 449.15

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Solution

The fourth proportional to 654.89, 980.91 and 449.15 is: 672.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.89 : 980.91 = 449.15 : x
  2. Step 2: Convert to fraction form
    654.89/980.91 = 449.15/x
  3. Step 3: Cross multiply
    654.89x = 980.91 × 449.15
  4. Step 4: Simplify right side
    654.89x = 440,570.82
  5. Step 5: Solve for x
    x = 440,570.82/654.89
  6. Step 6: Final answer
    x = 672.75

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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.