Home / 12,168.40-16,789.21-7,129.92

Finding the Fourth Proportional to 12,168.40, 16,789.21 and 7,129.92

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Solution

The fourth proportional to 12,168.40, 16,789.21 and 7,129.92 is: 9,837.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,168.40 : 16,789.21 = 7,129.92 : x
  2. Step 2: Convert to fraction form
    12,168.40/16,789.21 = 7,129.92/x
  3. Step 3: Cross multiply
    12,168.40x = 16,789.21 × 7,129.92
  4. Step 4: Simplify right side
    12,168.40x = 119,705,742.13
  5. Step 5: Solve for x
    x = 119,705,742.13/12,168.40
  6. Step 6: Final answer
    x = 9,837.42

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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.