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Finding the Fourth Proportional to 1,211.37, 1,671.30 and 838.41

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Solution

The fourth proportional to 1,211.37, 1,671.30 and 838.41 is: 1,156.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.37 : 1,671.30 = 838.41 : x
  2. Step 2: Convert to fraction form
    1,211.37/1,671.30 = 838.41/x
  3. Step 3: Cross multiply
    1,211.37x = 1,671.30 × 838.41
  4. Step 4: Simplify right side
    1,211.37x = 1,401,234.63
  5. Step 5: Solve for x
    x = 1,401,234.63/1,211.37
  6. Step 6: Final answer
    x = 1,156.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.