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Finding the Fourth Proportional to 1,296.89, 1,790.80 and 878.63

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Solution

The fourth proportional to 1,296.89, 1,790.80 and 878.63 is: 1,213.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.89 : 1,790.80 = 878.63 : x
  2. Step 2: Convert to fraction form
    1,296.89/1,790.80 = 878.63/x
  3. Step 3: Cross multiply
    1,296.89x = 1,790.80 × 878.63
  4. Step 4: Simplify right side
    1,296.89x = 1,573,450.60
  5. Step 5: Solve for x
    x = 1,573,450.60/1,296.89
  6. Step 6: Final answer
    x = 1,213.25

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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.