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Finding the Fourth Proportional to 2,782.78, 3,840.18 and 1,603.78

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Solution

The fourth proportional to 2,782.78, 3,840.18 and 1,603.78 is: 2,213.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,782.78 : 3,840.18 = 1,603.78 : x
  2. Step 2: Convert to fraction form
    2,782.78/3,840.18 = 1,603.78/x
  3. Step 3: Cross multiply
    2,782.78x = 3,840.18 × 1,603.78
  4. Step 4: Simplify right side
    2,782.78x = 6,158,803.88
  5. Step 5: Solve for x
    x = 6,158,803.88/2,782.78
  6. Step 6: Final answer
    x = 2,213.18

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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.