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Finding the Fourth Proportional to 1,243.09, 1,864.94 and 878.59

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Solution

The fourth proportional to 1,243.09, 1,864.94 and 878.59 is: 1,318.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.09 : 1,864.94 = 878.59 : x
  2. Step 2: Convert to fraction form
    1,243.09/1,864.94 = 878.59/x
  3. Step 3: Cross multiply
    1,243.09x = 1,864.94 × 878.59
  4. Step 4: Simplify right side
    1,243.09x = 1,638,517.63
  5. Step 5: Solve for x
    x = 1,638,517.63/1,243.09
  6. Step 6: Final answer
    x = 1,318.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.