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Finding the Fourth Proportional to 2,705.19, 4,057.65 and 857.58

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Solution

The fourth proportional to 2,705.19, 4,057.65 and 857.58 is: 1,286.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,705.19 : 4,057.65 = 857.58 : x
  2. Step 2: Convert to fraction form
    2,705.19/4,057.65 = 857.58/x
  3. Step 3: Cross multiply
    2,705.19x = 4,057.65 × 857.58
  4. Step 4: Simplify right side
    2,705.19x = 3,479,759.49
  5. Step 5: Solve for x
    x = 3,479,759.49/2,705.19
  6. Step 6: Final answer
    x = 1,286.33

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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.