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Finding the Fourth Proportional to 1,289.91, 1,778.90 and 1,091.16

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Solution

The fourth proportional to 1,289.91, 1,778.90 and 1,091.16 is: 1,504.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.91 : 1,778.90 = 1,091.16 : x
  2. Step 2: Convert to fraction form
    1,289.91/1,778.90 = 1,091.16/x
  3. Step 3: Cross multiply
    1,289.91x = 1,778.90 × 1,091.16
  4. Step 4: Simplify right side
    1,289.91x = 1,941,055.63
  5. Step 5: Solve for x
    x = 1,941,055.63/1,289.91
  6. Step 6: Final answer
    x = 1,504.80

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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.