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Finding the Fourth Proportional to 7,919.80, 11,879.70 and 5,308.60

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Solution

The fourth proportional to 7,919.80, 11,879.70 and 5,308.60 is: 7,962.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,919.80 : 11,879.70 = 5,308.60 : x
  2. Step 2: Convert to fraction form
    7,919.80/11,879.70 = 5,308.60/x
  3. Step 3: Cross multiply
    7,919.80x = 11,879.70 × 5,308.60
  4. Step 4: Simplify right side
    7,919.80x = 63,064,575.42
  5. Step 5: Solve for x
    x = 63,064,575.42/7,919.80
  6. Step 6: Final answer
    x = 7,962.90

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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.