Home / 12,120.40-18,172.50-9,783.28

Finding the Fourth Proportional to 12,120.40, 18,172.50 and 9,783.28

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Solution

The fourth proportional to 12,120.40, 18,172.50 and 9,783.28 is: 14,668.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,120.40 : 18,172.50 = 9,783.28 : x
  2. Step 2: Convert to fraction form
    12,120.40/18,172.50 = 9,783.28/x
  3. Step 3: Cross multiply
    12,120.40x = 18,172.50 × 9,783.28
  4. Step 4: Simplify right side
    12,120.40x = 177,786,655.80
  5. Step 5: Solve for x
    x = 177,786,655.80/12,120.40
  6. Step 6: Final answer
    x = 14,668.38

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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.