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Finding the Fourth Proportional to 12,380.48, 17,079.08 and 8,129.88

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Solution

The fourth proportional to 12,380.48, 17,079.08 and 8,129.88 is: 11,215.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,380.48 : 17,079.08 = 8,129.88 : x
  2. Step 2: Convert to fraction form
    12,380.48/17,079.08 = 8,129.88/x
  3. Step 3: Cross multiply
    12,380.48x = 17,079.08 × 8,129.88
  4. Step 4: Simplify right side
    12,380.48x = 138,850,870.91
  5. Step 5: Solve for x
    x = 138,850,870.91/12,380.48
  6. Step 6: Final answer
    x = 11,215.31

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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.