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Finding the Fourth Proportional to 1,078.11, 1,487.25 and 879.21

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Solution

The fourth proportional to 1,078.11, 1,487.25 and 879.21 is: 1,212.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.11 : 1,487.25 = 879.21 : x
  2. Step 2: Convert to fraction form
    1,078.11/1,487.25 = 879.21/x
  3. Step 3: Cross multiply
    1,078.11x = 1,487.25 × 879.21
  4. Step 4: Simplify right side
    1,078.11x = 1,307,605.07
  5. Step 5: Solve for x
    x = 1,307,605.07/1,078.11
  6. Step 6: Final answer
    x = 1,212.87

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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.