Home / 20,136.80-30,142.33-12,730.16

Finding the Fourth Proportional to 20,136.80, 30,142.33 and 12,730.16

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Solution

The fourth proportional to 20,136.80, 30,142.33 and 12,730.16 is: 19,055.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,136.80 : 30,142.33 = 12,730.16 : x
  2. Step 2: Convert to fraction form
    20,136.80/30,142.33 = 12,730.16/x
  3. Step 3: Cross multiply
    20,136.80x = 30,142.33 × 12,730.16
  4. Step 4: Simplify right side
    20,136.80x = 383,716,727.20
  5. Step 5: Solve for x
    x = 383,716,727.20/20,136.80
  6. Step 6: Final answer
    x = 19,055.49

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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.