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Finding the Fourth Proportional to 3,305.70, 4,958.28 and 840.42

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Solution

The fourth proportional to 3,305.70, 4,958.28 and 840.42 is: 1,260.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,305.70 : 4,958.28 = 840.42 : x
  2. Step 2: Convert to fraction form
    3,305.70/4,958.28 = 840.42/x
  3. Step 3: Cross multiply
    3,305.70x = 4,958.28 × 840.42
  4. Step 4: Simplify right side
    3,305.70x = 4,167,037.68
  5. Step 5: Solve for x
    x = 4,167,037.68/3,305.70
  6. Step 6: Final answer
    x = 1,260.56

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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.