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Finding the Fourth Proportional to 3,580, 4,940.80 and 2,087.60

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Solution

The fourth proportional to 3,580, 4,940.80 and 2,087.60 is: 2,881.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,580 : 4,940.80 = 2,087.60 : x
  2. Step 2: Convert to fraction form
    3,580/4,940.80 = 2,087.60/x
  3. Step 3: Cross multiply
    3,580x = 4,940.80 × 2,087.60
  4. Step 4: Simplify right side
    3,580x = 10,314,414.08
  5. Step 5: Solve for x
    x = 10,314,414.08/3,580
  6. Step 6: Final answer
    x = 2,881.12

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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.