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Finding the Fourth Proportional to 2,658.90, 3,988.21 and 809.97

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Solution

The fourth proportional to 2,658.90, 3,988.21 and 809.97 is: 1,214.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,658.90 : 3,988.21 = 809.97 : x
  2. Step 2: Convert to fraction form
    2,658.90/3,988.21 = 809.97/x
  3. Step 3: Cross multiply
    2,658.90x = 3,988.21 × 809.97
  4. Step 4: Simplify right side
    2,658.90x = 3,230,330.45
  5. Step 5: Solve for x
    x = 3,230,330.45/2,658.90
  6. Step 6: Final answer
    x = 1,214.91

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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.