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Finding the Fourth Proportional to 2,603.88, 3,905.40 and 961.20

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Solution

The fourth proportional to 2,603.88, 3,905.40 and 961.20 is: 1,441.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,603.88 : 3,905.40 = 961.20 : x
  2. Step 2: Convert to fraction form
    2,603.88/3,905.40 = 961.20/x
  3. Step 3: Cross multiply
    2,603.88x = 3,905.40 × 961.20
  4. Step 4: Simplify right side
    2,603.88x = 3,753,870.48
  5. Step 5: Solve for x
    x = 3,753,870.48/2,603.88
  6. Step 6: Final answer
    x = 1,441.64

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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.