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Finding the Fourth Proportional to 28,003.80, 42,005.70 and 20,640.90

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Solution

The fourth proportional to 28,003.80, 42,005.70 and 20,640.90 is: 30,961.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,003.80 : 42,005.70 = 20,640.90 : x
  2. Step 2: Convert to fraction form
    28,003.80/42,005.70 = 20,640.90/x
  3. Step 3: Cross multiply
    28,003.80x = 42,005.70 × 20,640.90
  4. Step 4: Simplify right side
    28,003.80x = 867,035,453.13
  5. Step 5: Solve for x
    x = 867,035,453.13/28,003.80
  6. Step 6: Final answer
    x = 30,961.35

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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.