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Finding the Fourth Proportional to 13,121.76, 18,103.92 and 7,814.88

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Solution

The fourth proportional to 13,121.76, 18,103.92 and 7,814.88 is: 10,782.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.76 : 18,103.92 = 7,814.88 : x
  2. Step 2: Convert to fraction form
    13,121.76/18,103.92 = 7,814.88/x
  3. Step 3: Cross multiply
    13,121.76x = 18,103.92 × 7,814.88
  4. Step 4: Simplify right side
    13,121.76x = 141,479,962.33
  5. Step 5: Solve for x
    x = 141,479,962.33/13,121.76
  6. Step 6: Final answer
    x = 10,782.09

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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.