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Finding the Fourth Proportional to 1,778.81, 2,454.91 and 982.21

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Solution

The fourth proportional to 1,778.81, 2,454.91 and 982.21 is: 1,355.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,778.81 : 2,454.91 = 982.21 : x
  2. Step 2: Convert to fraction form
    1,778.81/2,454.91 = 982.21/x
  3. Step 3: Cross multiply
    1,778.81x = 2,454.91 × 982.21
  4. Step 4: Simplify right side
    1,778.81x = 2,411,237.15
  5. Step 5: Solve for x
    x = 2,411,237.15/1,778.81
  6. Step 6: Final answer
    x = 1,355.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.