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Finding the Fourth Proportional to 879.26, 1,212.12 and 692

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Solution

The fourth proportional to 879.26, 1,212.12 and 692 is: 953.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.26 : 1,212.12 = 692 : x
  2. Step 2: Convert to fraction form
    879.26/1,212.12 = 692/x
  3. Step 3: Cross multiply
    879.26x = 1,212.12 × 692
  4. Step 4: Simplify right side
    879.26x = 838,787.04
  5. Step 5: Solve for x
    x = 838,787.04/879.26
  6. Step 6: Final answer
    x = 953.97

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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.