Home / 12,390.20-18,550.20-9,621.80

Finding the Fourth Proportional to 12,390.20, 18,550.20 and 9,621.80

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Solution

The fourth proportional to 12,390.20, 18,550.20 and 9,621.80 is: 14,405.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.20 : 18,550.20 = 9,621.80 : x
  2. Step 2: Convert to fraction form
    12,390.20/18,550.20 = 9,621.80/x
  3. Step 3: Cross multiply
    12,390.20x = 18,550.20 × 9,621.80
  4. Step 4: Simplify right side
    12,390.20x = 178,486,314.36
  5. Step 5: Solve for x
    x = 178,486,314.36/12,390.20
  6. Step 6: Final answer
    x = 14,405.44

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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.