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Finding the Fourth Proportional to 4,990.40, 7,472.40 and 3,998.60

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Solution

The fourth proportional to 4,990.40, 7,472.40 and 3,998.60 is: 5,987.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,990.40 : 7,472.40 = 3,998.60 : x
  2. Step 2: Convert to fraction form
    4,990.40/7,472.40 = 3,998.60/x
  3. Step 3: Cross multiply
    4,990.40x = 7,472.40 × 3,998.60
  4. Step 4: Simplify right side
    4,990.40x = 29,879,138.64
  5. Step 5: Solve for x
    x = 29,879,138.64/4,990.40
  6. Step 6: Final answer
    x = 5,987.32

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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.