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Finding the Fourth Proportional to 1,860.99, 2,791.70 and 820.55

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Solution

The fourth proportional to 1,860.99, 2,791.70 and 820.55 is: 1,230.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,860.99 : 2,791.70 = 820.55 : x
  2. Step 2: Convert to fraction form
    1,860.99/2,791.70 = 820.55/x
  3. Step 3: Cross multiply
    1,860.99x = 2,791.70 × 820.55
  4. Step 4: Simplify right side
    1,860.99x = 2,290,713.43
  5. Step 5: Solve for x
    x = 2,290,713.43/1,860.99
  6. Step 6: Final answer
    x = 1,230.91

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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.