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Finding the Fourth Proportional to 3,761.12, 5,640.12 and 1,420.72

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Solution

The fourth proportional to 3,761.12, 5,640.12 and 1,420.72 is: 2,130.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,761.12 : 5,640.12 = 1,420.72 : x
  2. Step 2: Convert to fraction form
    3,761.12/5,640.12 = 1,420.72/x
  3. Step 3: Cross multiply
    3,761.12x = 5,640.12 × 1,420.72
  4. Step 4: Simplify right side
    3,761.12x = 8,013,003.09
  5. Step 5: Solve for x
    x = 8,013,003.09/3,761.12
  6. Step 6: Final answer
    x = 2,130.48

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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.