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Finding the Fourth Proportional to 3,904.40, 5,840.40 and 3,321.20

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Solution

The fourth proportional to 3,904.40, 5,840.40 and 3,321.20 is: 4,968.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,904.40 : 5,840.40 = 3,321.20 : x
  2. Step 2: Convert to fraction form
    3,904.40/5,840.40 = 3,321.20/x
  3. Step 3: Cross multiply
    3,904.40x = 5,840.40 × 3,321.20
  4. Step 4: Simplify right side
    3,904.40x = 19,397,136.48
  5. Step 5: Solve for x
    x = 19,397,136.48/3,904.40
  6. Step 6: Final answer
    x = 4,968.02

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1.5x scale

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.