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Finding the Fourth Proportional to 879.41, 1,212.45 and 721.46

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Solution

The fourth proportional to 879.41, 1,212.45 and 721.46 is: 994.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.41 : 1,212.45 = 721.46 : x
  2. Step 2: Convert to fraction form
    879.41/1,212.45 = 721.46/x
  3. Step 3: Cross multiply
    879.41x = 1,212.45 × 721.46
  4. Step 4: Simplify right side
    879.41x = 874,734.18
  5. Step 5: Solve for x
    x = 874,734.18/879.41
  6. Step 6: Final answer
    x = 994.68

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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.