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Finding the Fourth Proportional to 1,858.04, 2,786.40 and 762.20

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Solution

The fourth proportional to 1,858.04, 2,786.40 and 762.20 is: 1,143.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858.04 : 2,786.40 = 762.20 : x
  2. Step 2: Convert to fraction form
    1,858.04/2,786.40 = 762.20/x
  3. Step 3: Cross multiply
    1,858.04x = 2,786.40 × 762.20
  4. Step 4: Simplify right side
    1,858.04x = 2,123,794.08
  5. Step 5: Solve for x
    x = 2,123,794.08/1,858.04
  6. Step 6: Final answer
    x = 1,143.03

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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.