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Finding the Fourth Proportional to 2,782.81, 3,840.28 and 1,603.88

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Solution

The fourth proportional to 2,782.81, 3,840.28 and 1,603.88 is: 2,213.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,782.81 : 3,840.28 = 1,603.88 : x
  2. Step 2: Convert to fraction form
    2,782.81/3,840.28 = 1,603.88/x
  3. Step 3: Cross multiply
    2,782.81x = 3,840.28 × 1,603.88
  4. Step 4: Simplify right side
    2,782.81x = 6,159,348.29
  5. Step 5: Solve for x
    x = 6,159,348.29/2,782.81
  6. Step 6: Final answer
    x = 2,213.36

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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.