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Finding the Fourth Proportional to 1,745.12, 2,618.09 and 771.50

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Solution

The fourth proportional to 1,745.12, 2,618.09 and 771.50 is: 1,157.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,745.12 : 2,618.09 = 771.50 : x
  2. Step 2: Convert to fraction form
    1,745.12/2,618.09 = 771.50/x
  3. Step 3: Cross multiply
    1,745.12x = 2,618.09 × 771.50
  4. Step 4: Simplify right side
    1,745.12x = 2,019,862.02
  5. Step 5: Solve for x
    x = 2,019,862.02/1,745.12
  6. Step 6: Final answer
    x = 1,157.43

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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.