Home / 12,480.10-18,720.51-3,120.10

Finding the Fourth Proportional to 12,480.10, 18,720.51 and 3,120.10

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Solution

The fourth proportional to 12,480.10, 18,720.51 and 3,120.10 is: 4,680.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,480.10 : 18,720.51 = 3,120.10 : x
  2. Step 2: Convert to fraction form
    12,480.10/18,720.51 = 3,120.10/x
  3. Step 3: Cross multiply
    12,480.10x = 18,720.51 × 3,120.10
  4. Step 4: Simplify right side
    12,480.10x = 58,409,863.25
  5. Step 5: Solve for x
    x = 58,409,863.25/12,480.10
  6. Step 6: Final answer
    x = 4,680.24

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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.