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Finding the Fourth Proportional to 2,658.73, 3,988.24 and 809.90

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Solution

The fourth proportional to 2,658.73, 3,988.24 and 809.90 is: 1,214.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,658.73 : 3,988.24 = 809.90 : x
  2. Step 2: Convert to fraction form
    2,658.73/3,988.24 = 809.90/x
  3. Step 3: Cross multiply
    2,658.73x = 3,988.24 × 809.90
  4. Step 4: Simplify right side
    2,658.73x = 3,230,075.58
  5. Step 5: Solve for x
    x = 3,230,075.58/2,658.73
  6. Step 6: Final answer
    x = 1,214.89

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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.