Home / 12,739.20-19,108.78-8,355.62

Finding the Fourth Proportional to 12,739.20, 19,108.78 and 8,355.62

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Solution

The fourth proportional to 12,739.20, 19,108.78 and 8,355.62 is: 12,533.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,739.20 : 19,108.78 = 8,355.62 : x
  2. Step 2: Convert to fraction form
    12,739.20/19,108.78 = 8,355.62/x
  3. Step 3: Cross multiply
    12,739.20x = 19,108.78 × 8,355.62
  4. Step 4: Simplify right side
    12,739.20x = 159,665,704.34
  5. Step 5: Solve for x
    x = 159,665,704.34/12,739.20
  6. Step 6: Final answer
    x = 12,533.42

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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.