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Finding the Fourth Proportional to 879.05, 1,213.48 and 839.87

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Solution

The fourth proportional to 879.05, 1,213.48 and 839.87 is: 1,159.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.05 : 1,213.48 = 839.87 : x
  2. Step 2: Convert to fraction form
    879.05/1,213.48 = 839.87/x
  3. Step 3: Cross multiply
    879.05x = 1,213.48 × 839.87
  4. Step 4: Simplify right side
    879.05x = 1,019,164.98
  5. Step 5: Solve for x
    x = 1,019,164.98/879.05
  6. Step 6: Final answer
    x = 1,159.39

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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.