Home / 12,811.40-19,219.62-5,415.80

Finding the Fourth Proportional to 12,811.40, 19,219.62 and 5,415.80

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Solution

The fourth proportional to 12,811.40, 19,219.62 and 5,415.80 is: 8,124.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,811.40 : 19,219.62 = 5,415.80 : x
  2. Step 2: Convert to fraction form
    12,811.40/19,219.62 = 5,415.80/x
  3. Step 3: Cross multiply
    12,811.40x = 19,219.62 × 5,415.80
  4. Step 4: Simplify right side
    12,811.40x = 104,089,618.00
  5. Step 5: Solve for x
    x = 104,089,618.00/12,811.40
  6. Step 6: Final answer
    x = 8,124.77

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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.