Home / 1,261.60-1,890.78-850.12

Finding the Fourth Proportional to 1,261.60, 1,890.78 and 850.12

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Solution

The fourth proportional to 1,261.60, 1,890.78 and 850.12 is: 1,274.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.60 : 1,890.78 = 850.12 : x
  2. Step 2: Convert to fraction form
    1,261.60/1,890.78 = 850.12/x
  3. Step 3: Cross multiply
    1,261.60x = 1,890.78 × 850.12
  4. Step 4: Simplify right side
    1,261.60x = 1,607,389.89
  5. Step 5: Solve for x
    x = 1,607,389.89/1,261.60
  6. Step 6: Final answer
    x = 1,274.09

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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.