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Finding the Fourth Proportional to 2,739.81, 4,109.71 and 891.11

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Solution

The fourth proportional to 2,739.81, 4,109.71 and 891.11 is: 1,336.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,739.81 : 4,109.71 = 891.11 : x
  2. Step 2: Convert to fraction form
    2,739.81/4,109.71 = 891.11/x
  3. Step 3: Cross multiply
    2,739.81x = 4,109.71 × 891.11
  4. Step 4: Simplify right side
    2,739.81x = 3,662,203.68
  5. Step 5: Solve for x
    x = 3,662,203.68/2,739.81
  6. Step 6: Final answer
    x = 1,336.66

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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.