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Finding the Fourth Proportional to 2,570.35, 3,855.60 and 815.36

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Solution

The fourth proportional to 2,570.35, 3,855.60 and 815.36 is: 1,223.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,570.35 : 3,855.60 = 815.36 : x
  2. Step 2: Convert to fraction form
    2,570.35/3,855.60 = 815.36/x
  3. Step 3: Cross multiply
    2,570.35x = 3,855.60 × 815.36
  4. Step 4: Simplify right side
    2,570.35x = 3,143,694.14
  5. Step 5: Solve for x
    x = 3,143,694.14/2,570.35
  6. Step 6: Final answer
    x = 1,223.06

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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.