Home / 19,815.20-29,703.60-8,112.80

Finding the Fourth Proportional to 19,815.20, 29,703.60 and 8,112.80

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Solution

The fourth proportional to 19,815.20, 29,703.60 and 8,112.80 is: 12,161.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,815.20 : 29,703.60 = 8,112.80 : x
  2. Step 2: Convert to fraction form
    19,815.20/29,703.60 = 8,112.80/x
  3. Step 3: Cross multiply
    19,815.20x = 29,703.60 × 8,112.80
  4. Step 4: Simplify right side
    19,815.20x = 240,979,366.08
  5. Step 5: Solve for x
    x = 240,979,366.08/19,815.20
  6. Step 6: Final answer
    x = 12,161.34

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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.