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Finding the Fourth Proportional to 2,616.90, 3,922.05 and 1,384.86

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Solution

The fourth proportional to 2,616.90, 3,922.05 and 1,384.86 is: 2,075.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,616.90 : 3,922.05 = 1,384.86 : x
  2. Step 2: Convert to fraction form
    2,616.90/3,922.05 = 1,384.86/x
  3. Step 3: Cross multiply
    2,616.90x = 3,922.05 × 1,384.86
  4. Step 4: Simplify right side
    2,616.90x = 5,431,490.16
  5. Step 5: Solve for x
    x = 5,431,490.16/2,616.90
  6. Step 6: Final answer
    x = 2,075.54

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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.