Home / 28,138.96-38,832.78-15,563.80

Finding the Fourth Proportional to 28,138.96, 38,832.78 and 15,563.80

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Solution

The fourth proportional to 28,138.96, 38,832.78 and 15,563.80 is: 21,478.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,138.96 : 38,832.78 = 15,563.80 : x
  2. Step 2: Convert to fraction form
    28,138.96/38,832.78 = 15,563.80/x
  3. Step 3: Cross multiply
    28,138.96x = 38,832.78 × 15,563.80
  4. Step 4: Simplify right side
    28,138.96x = 604,385,621.36
  5. Step 5: Solve for x
    x = 604,385,621.36/28,138.96
  6. Step 6: Final answer
    x = 21,478.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.