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Finding the Fourth Proportional to 20,661.80, 30,999.90 and 8,983.40

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Solution

The fourth proportional to 20,661.80, 30,999.90 and 8,983.40 is: 13,478.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.80 : 30,999.90 = 8,983.40 : x
  2. Step 2: Convert to fraction form
    20,661.80/30,999.90 = 8,983.40/x
  3. Step 3: Cross multiply
    20,661.80x = 30,999.90 × 8,983.40
  4. Step 4: Simplify right side
    20,661.80x = 278,484,501.66
  5. Step 5: Solve for x
    x = 278,484,501.66/20,661.80
  6. Step 6: Final answer
    x = 13,478.23

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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.