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Finding the Fourth Proportional to 942.13, 1,299.37 and 879.26

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Solution

The fourth proportional to 942.13, 1,299.37 and 879.26 is: 1,212.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.13 : 1,299.37 = 879.26 : x
  2. Step 2: Convert to fraction form
    942.13/1,299.37 = 879.26/x
  3. Step 3: Cross multiply
    942.13x = 1,299.37 × 879.26
  4. Step 4: Simplify right side
    942.13x = 1,142,474.55
  5. Step 5: Solve for x
    x = 1,142,474.55/942.13
  6. Step 6: Final answer
    x = 1,212.65

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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.