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Finding the Fourth Proportional to 1,213.41, 1,678.02 and 1,191.54

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Solution

The fourth proportional to 1,213.41, 1,678.02 and 1,191.54 is: 1,647.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.41 : 1,678.02 = 1,191.54 : x
  2. Step 2: Convert to fraction form
    1,213.41/1,678.02 = 1,191.54/x
  3. Step 3: Cross multiply
    1,213.41x = 1,678.02 × 1,191.54
  4. Step 4: Simplify right side
    1,213.41x = 1,999,427.95
  5. Step 5: Solve for x
    x = 1,999,427.95/1,213.41
  6. Step 6: Final answer
    x = 1,647.78

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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.