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Finding the Fourth Proportional to 879.08, 1,211.96 and 721.12

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Solution

The fourth proportional to 879.08, 1,211.96 and 721.12 is: 994.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.08 : 1,211.96 = 721.12 : x
  2. Step 2: Convert to fraction form
    879.08/1,211.96 = 721.12/x
  3. Step 3: Cross multiply
    879.08x = 1,211.96 × 721.12
  4. Step 4: Simplify right side
    879.08x = 873,968.60
  5. Step 5: Solve for x
    x = 873,968.60/879.08
  6. Step 6: Final answer
    x = 994.19

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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.