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Finding the Fourth Proportional to 879.54, 1,211.88 and 721.64

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Solution

The fourth proportional to 879.54, 1,211.88 and 721.64 is: 994.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.54 : 1,211.88 = 721.64 : x
  2. Step 2: Convert to fraction form
    879.54/1,211.88 = 721.64/x
  3. Step 3: Cross multiply
    879.54x = 1,211.88 × 721.64
  4. Step 4: Simplify right side
    879.54x = 874,541.08
  5. Step 5: Solve for x
    x = 874,541.08/879.54
  6. Step 6: Final answer
    x = 994.32

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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.