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Finding the Fourth Proportional to 28,003.92, 38,622.60 and 20,936.40

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Solution

The fourth proportional to 28,003.92, 38,622.60 and 20,936.40 is: 28,875.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,003.92 : 38,622.60 = 20,936.40 : x
  2. Step 2: Convert to fraction form
    28,003.92/38,622.60 = 20,936.40/x
  3. Step 3: Cross multiply
    28,003.92x = 38,622.60 × 20,936.40
  4. Step 4: Simplify right side
    28,003.92x = 808,618,202.64
  5. Step 5: Solve for x
    x = 808,618,202.64/28,003.92
  6. Step 6: Final answer
    x = 28,875.18

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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.