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Finding the Fourth Proportional to 2,572.85, 3,855.22 and 1,989.28

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Solution

The fourth proportional to 2,572.85, 3,855.22 and 1,989.28 is: 2,980.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,572.85 : 3,855.22 = 1,989.28 : x
  2. Step 2: Convert to fraction form
    2,572.85/3,855.22 = 1,989.28/x
  3. Step 3: Cross multiply
    2,572.85x = 3,855.22 × 1,989.28
  4. Step 4: Simplify right side
    2,572.85x = 7,669,112.04
  5. Step 5: Solve for x
    x = 7,669,112.04/2,572.85
  6. Step 6: Final answer
    x = 2,980.78

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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.