Home / 12,480.90-18,720.78-3,120.96

Finding the Fourth Proportional to 12,480.90, 18,720.78 and 3,120.96

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Solution

The fourth proportional to 12,480.90, 18,720.78 and 3,120.96 is: 4,681.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,480.90 : 18,720.78 = 3,120.96 : x
  2. Step 2: Convert to fraction form
    12,480.90/18,720.78 = 3,120.96/x
  3. Step 3: Cross multiply
    12,480.90x = 18,720.78 × 3,120.96
  4. Step 4: Simplify right side
    12,480.90x = 58,426,805.55
  5. Step 5: Solve for x
    x = 58,426,805.55/12,480.90
  6. Step 6: Final answer
    x = 4,681.30

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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.