Home / 12,480.20-18,720.30-3,718.16

Finding the Fourth Proportional to 12,480.20, 18,720.30 and 3,718.16

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Solution

The fourth proportional to 12,480.20, 18,720.30 and 3,718.16 is: 5,577.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,480.20 : 18,720.30 = 3,718.16 : x
  2. Step 2: Convert to fraction form
    12,480.20/18,720.30 = 3,718.16/x
  3. Step 3: Cross multiply
    12,480.20x = 18,720.30 × 3,718.16
  4. Step 4: Simplify right side
    12,480.20x = 69,605,070.65
  5. Step 5: Solve for x
    x = 69,605,070.65/12,480.20
  6. Step 6: Final answer
    x = 5,577.24

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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.