Home / 13,621.68-18,781.86-12,780.90

Finding the Fourth Proportional to 13,621.68, 18,781.86 and 12,780.90

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Solution

The fourth proportional to 13,621.68, 18,781.86 and 12,780.90 is: 17,622.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,621.68 : 18,781.86 = 12,780.90 : x
  2. Step 2: Convert to fraction form
    13,621.68/18,781.86 = 12,780.90/x
  3. Step 3: Cross multiply
    13,621.68x = 18,781.86 × 12,780.90
  4. Step 4: Simplify right side
    13,621.68x = 240,049,074.47
  5. Step 5: Solve for x
    x = 240,049,074.47/13,621.68
  6. Step 6: Final answer
    x = 17,622.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.