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Finding the Fourth Proportional to 711.80, 982.06 and 449.90

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Solution

The fourth proportional to 711.80, 982.06 and 449.90 is: 620.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.80 : 982.06 = 449.90 : x
  2. Step 2: Convert to fraction form
    711.80/982.06 = 449.90/x
  3. Step 3: Cross multiply
    711.80x = 982.06 × 449.90
  4. Step 4: Simplify right side
    711.80x = 441,828.79
  5. Step 5: Solve for x
    x = 441,828.79/711.80
  6. Step 6: Final answer
    x = 620.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.