Home / 12,147.20-18,220.80-6,949.40

Finding the Fourth Proportional to 12,147.20, 18,220.80 and 6,949.40

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Solution

The fourth proportional to 12,147.20, 18,220.80 and 6,949.40 is: 10,424.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,147.20 : 18,220.80 = 6,949.40 : x
  2. Step 2: Convert to fraction form
    12,147.20/18,220.80 = 6,949.40/x
  3. Step 3: Cross multiply
    12,147.20x = 18,220.80 × 6,949.40
  4. Step 4: Simplify right side
    12,147.20x = 126,623,627.52
  5. Step 5: Solve for x
    x = 126,623,627.52/12,147.20
  6. Step 6: Final answer
    x = 10,424.10

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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.