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Finding the Fourth Proportional to 2,855.56, 4,284.90 and 1,988.20

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Solution

The fourth proportional to 2,855.56, 4,284.90 and 1,988.20 is: 2,983.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,855.56 : 4,284.90 = 1,988.20 : x
  2. Step 2: Convert to fraction form
    2,855.56/4,284.90 = 1,988.20/x
  3. Step 3: Cross multiply
    2,855.56x = 4,284.90 × 1,988.20
  4. Step 4: Simplify right side
    2,855.56x = 8,519,238.18
  5. Step 5: Solve for x
    x = 8,519,238.18/2,855.56
  6. Step 6: Final answer
    x = 2,983.39

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1.5x scale

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.