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Finding the Fourth Proportional to 1,229.68, 1,694.62 and 879.76

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Solution

The fourth proportional to 1,229.68, 1,694.62 and 879.76 is: 1,212.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.68 : 1,694.62 = 879.76 : x
  2. Step 2: Convert to fraction form
    1,229.68/1,694.62 = 879.76/x
  3. Step 3: Cross multiply
    1,229.68x = 1,694.62 × 879.76
  4. Step 4: Simplify right side
    1,229.68x = 1,490,858.89
  5. Step 5: Solve for x
    x = 1,490,858.89/1,229.68
  6. Step 6: Final answer
    x = 1,212.40

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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.