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Finding the Fourth Proportional to 3,919.90, 5,879.86 and 998.20

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Solution

The fourth proportional to 3,919.90, 5,879.86 and 998.20 is: 1,497.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,919.90 : 5,879.86 = 998.20 : x
  2. Step 2: Convert to fraction form
    3,919.90/5,879.86 = 998.20/x
  3. Step 3: Cross multiply
    3,919.90x = 5,879.86 × 998.20
  4. Step 4: Simplify right side
    3,919.90x = 5,869,276.25
  5. Step 5: Solve for x
    x = 5,869,276.25/3,919.90
  6. Step 6: Final answer
    x = 1,497.30

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.