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Finding the Fourth Proportional to 1,851.21, 2,775.96 and 680.92

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Solution

The fourth proportional to 1,851.21, 2,775.96 and 680.92 is: 1,021.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,851.21 : 2,775.96 = 680.92 : x
  2. Step 2: Convert to fraction form
    1,851.21/2,775.96 = 680.92/x
  3. Step 3: Cross multiply
    1,851.21x = 2,775.96 × 680.92
  4. Step 4: Simplify right side
    1,851.21x = 1,890,199.74
  5. Step 5: Solve for x
    x = 1,890,199.74/1,851.21
  6. Step 6: Final answer
    x = 1,021.06

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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.