Home / 12,120.90-18,173.25-9,783.78

Finding the Fourth Proportional to 12,120.90, 18,173.25 and 9,783.78

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Solution

The fourth proportional to 12,120.90, 18,173.25 and 9,783.78 is: 14,669.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,120.90 : 18,173.25 = 9,783.78 : x
  2. Step 2: Convert to fraction form
    12,120.90/18,173.25 = 9,783.78/x
  3. Step 3: Cross multiply
    12,120.90x = 18,173.25 × 9,783.78
  4. Step 4: Simplify right side
    12,120.90x = 177,803,079.89
  5. Step 5: Solve for x
    x = 177,803,079.89/12,120.90
  6. Step 6: Final answer
    x = 14,669.13

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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.