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Finding the Fourth Proportional to 2,855.40, 4,285.80 and 1,761.90

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Solution

The fourth proportional to 2,855.40, 4,285.80 and 1,761.90 is: 2,644.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,855.40 : 4,285.80 = 1,761.90 : x
  2. Step 2: Convert to fraction form
    2,855.40/4,285.80 = 1,761.90/x
  3. Step 3: Cross multiply
    2,855.40x = 4,285.80 × 1,761.90
  4. Step 4: Simplify right side
    2,855.40x = 7,551,151.02
  5. Step 5: Solve for x
    x = 7,551,151.02/2,855.40
  6. Step 6: Final answer
    x = 2,644.52

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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.