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Finding the Fourth Proportional to 12,811.30, 19,216.95 and 10,219.30

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Solution

The fourth proportional to 12,811.30, 19,216.95 and 10,219.30 is: 15,328.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,811.30 : 19,216.95 = 10,219.30 : x
  2. Step 2: Convert to fraction form
    12,811.30/19,216.95 = 10,219.30/x
  3. Step 3: Cross multiply
    12,811.30x = 19,216.95 × 10,219.30
  4. Step 4: Simplify right side
    12,811.30x = 196,383,777.14
  5. Step 5: Solve for x
    x = 196,383,777.14/12,811.30
  6. Step 6: Final answer
    x = 15,328.95

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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.