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Finding the Fourth Proportional to 12,208.40, 18,312.60 and 12,078.80

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Solution

The fourth proportional to 12,208.40, 18,312.60 and 12,078.80 is: 18,118.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,208.40 : 18,312.60 = 12,078.80 : x
  2. Step 2: Convert to fraction form
    12,208.40/18,312.60 = 12,078.80/x
  3. Step 3: Cross multiply
    12,208.40x = 18,312.60 × 12,078.80
  4. Step 4: Simplify right side
    12,208.40x = 221,194,232.88
  5. Step 5: Solve for x
    x = 221,194,232.88/12,208.40
  6. Step 6: Final answer
    x = 18,118.20

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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.