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Finding the Fourth Proportional to 2,751.80, 4,128.32 and 1,365.90

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Solution

The fourth proportional to 2,751.80, 4,128.32 and 1,365.90 is: 2,049.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,751.80 : 4,128.32 = 1,365.90 : x
  2. Step 2: Convert to fraction form
    2,751.80/4,128.32 = 1,365.90/x
  3. Step 3: Cross multiply
    2,751.80x = 4,128.32 × 1,365.90
  4. Step 4: Simplify right side
    2,751.80x = 5,638,872.29
  5. Step 5: Solve for x
    x = 5,638,872.29/2,751.80
  6. Step 6: Final answer
    x = 2,049.16

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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.