Home / 12,308.90-18,467.40-3,990.20

Finding the Fourth Proportional to 12,308.90, 18,467.40 and 3,990.20

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Solution

The fourth proportional to 12,308.90, 18,467.40 and 3,990.20 is: 5,986.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,308.90 : 18,467.40 = 3,990.20 : x
  2. Step 2: Convert to fraction form
    12,308.90/18,467.40 = 3,990.20/x
  3. Step 3: Cross multiply
    12,308.90x = 18,467.40 × 3,990.20
  4. Step 4: Simplify right side
    12,308.90x = 73,688,619.48
  5. Step 5: Solve for x
    x = 73,688,619.48/12,308.90
  6. Step 6: Final answer
    x = 5,986.61

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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.