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Finding the Fourth Proportional to 1,860.57, 2,790.77 and 820.30

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Solution

The fourth proportional to 1,860.57, 2,790.77 and 820.30 is: 1,230.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,860.57 : 2,790.77 = 820.30 : x
  2. Step 2: Convert to fraction form
    1,860.57/2,790.77 = 820.30/x
  3. Step 3: Cross multiply
    1,860.57x = 2,790.77 × 820.30
  4. Step 4: Simplify right side
    1,860.57x = 2,289,256.73
  5. Step 5: Solve for x
    x = 2,289,256.73/1,860.57
  6. Step 6: Final answer
    x = 1,230.40

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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.