Home / 30,186.80-45,280.20-20,855.60

Finding the Fourth Proportional to 30,186.80, 45,280.20 and 20,855.60

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Solution

The fourth proportional to 30,186.80, 45,280.20 and 20,855.60 is: 31,283.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,186.80 : 45,280.20 = 20,855.60 : x
  2. Step 2: Convert to fraction form
    30,186.80/45,280.20 = 20,855.60/x
  3. Step 3: Cross multiply
    30,186.80x = 45,280.20 × 20,855.60
  4. Step 4: Simplify right side
    30,186.80x = 944,345,739.12
  5. Step 5: Solve for x
    x = 944,345,739.12/30,186.80
  6. Step 6: Final answer
    x = 31,283.40

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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.