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Finding the Fourth Proportional to 1,222.41, 1,830.60 and 831

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Solution

The fourth proportional to 1,222.41, 1,830.60 and 831 is: 1,244.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.41 : 1,830.60 = 831 : x
  2. Step 2: Convert to fraction form
    1,222.41/1,830.60 = 831/x
  3. Step 3: Cross multiply
    1,222.41x = 1,830.60 × 831
  4. Step 4: Simplify right side
    1,222.41x = 1,521,228.60
  5. Step 5: Solve for x
    x = 1,521,228.60/1,222.41
  6. Step 6: Final answer
    x = 1,244.45

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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.