Home / 12,278.40-18,439.20-11,889.60

Finding the Fourth Proportional to 12,278.40, 18,439.20 and 11,889.60

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Solution

The fourth proportional to 12,278.40, 18,439.20 and 11,889.60 is: 17,855.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,278.40 : 18,439.20 = 11,889.60 : x
  2. Step 2: Convert to fraction form
    12,278.40/18,439.20 = 11,889.60/x
  3. Step 3: Cross multiply
    12,278.40x = 18,439.20 × 11,889.60
  4. Step 4: Simplify right side
    12,278.40x = 219,234,712.32
  5. Step 5: Solve for x
    x = 219,234,712.32/12,278.40
  6. Step 6: Final answer
    x = 17,855.32

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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.