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Finding the Fourth Proportional to 2,589.10, 3,883.58 and 641.28

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Solution

The fourth proportional to 2,589.10, 3,883.58 and 641.28 is: 961.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,589.10 : 3,883.58 = 641.28 : x
  2. Step 2: Convert to fraction form
    2,589.10/3,883.58 = 641.28/x
  3. Step 3: Cross multiply
    2,589.10x = 3,883.58 × 641.28
  4. Step 4: Simplify right side
    2,589.10x = 2,490,462.18
  5. Step 5: Solve for x
    x = 2,490,462.18/2,589.10
  6. Step 6: Final answer
    x = 961.90

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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.