Home / 12,980.20-19,470.30-9,221.80

Finding the Fourth Proportional to 12,980.20, 19,470.30 and 9,221.80

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Solution

The fourth proportional to 12,980.20, 19,470.30 and 9,221.80 is: 13,832.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,980.20 : 19,470.30 = 9,221.80 : x
  2. Step 2: Convert to fraction form
    12,980.20/19,470.30 = 9,221.80/x
  3. Step 3: Cross multiply
    12,980.20x = 19,470.30 × 9,221.80
  4. Step 4: Simplify right side
    12,980.20x = 179,551,212.54
  5. Step 5: Solve for x
    x = 179,551,212.54/12,980.20
  6. Step 6: Final answer
    x = 13,832.70

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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.