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Finding the Fourth Proportional to 1,380.63, 1,905.60 and 849.63

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Solution

The fourth proportional to 1,380.63, 1,905.60 and 849.63 is: 1,172.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.63 : 1,905.60 = 849.63 : x
  2. Step 2: Convert to fraction form
    1,380.63/1,905.60 = 849.63/x
  3. Step 3: Cross multiply
    1,380.63x = 1,905.60 × 849.63
  4. Step 4: Simplify right side
    1,380.63x = 1,619,054.93
  5. Step 5: Solve for x
    x = 1,619,054.93/1,380.63
  6. Step 6: Final answer
    x = 1,172.69

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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.