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Finding the Fourth Proportional to 1,857.41, 2,782.91 and 978.60

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Solution

The fourth proportional to 1,857.41, 2,782.91 and 978.60 is: 1,466.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,857.41 : 2,782.91 = 978.60 : x
  2. Step 2: Convert to fraction form
    1,857.41/2,782.91 = 978.60/x
  3. Step 3: Cross multiply
    1,857.41x = 2,782.91 × 978.60
  4. Step 4: Simplify right side
    1,857.41x = 2,723,350.83
  5. Step 5: Solve for x
    x = 2,723,350.83/1,857.41
  6. Step 6: Final answer
    x = 1,466.21

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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.