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Finding the Fourth Proportional to 8,670.60, 11,961.60 and 5,131.80

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Solution

The fourth proportional to 8,670.60, 11,961.60 and 5,131.80 is: 7,079.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,670.60 : 11,961.60 = 5,131.80 : x
  2. Step 2: Convert to fraction form
    8,670.60/11,961.60 = 5,131.80/x
  3. Step 3: Cross multiply
    8,670.60x = 11,961.60 × 5,131.80
  4. Step 4: Simplify right side
    8,670.60x = 61,384,538.88
  5. Step 5: Solve for x
    x = 61,384,538.88/8,670.60
  6. Step 6: Final answer
    x = 7,079.62

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1.5x scale

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.