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Finding the Fourth Proportional to 28,057.72, 38,720.80 and 16,124.80

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Solution

The fourth proportional to 28,057.72, 38,720.80 and 16,124.80 is: 22,252.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,057.72 : 38,720.80 = 16,124.80 : x
  2. Step 2: Convert to fraction form
    28,057.72/38,720.80 = 16,124.80/x
  3. Step 3: Cross multiply
    28,057.72x = 38,720.80 × 16,124.80
  4. Step 4: Simplify right side
    28,057.72x = 624,365,155.84
  5. Step 5: Solve for x
    x = 624,365,155.84/28,057.72
  6. Step 6: Final answer
    x = 22,252.88

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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.