Home / 20,129.20-30,218.10-19,983.40

Finding the Fourth Proportional to 20,129.20, 30,218.10 and 19,983.40

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Solution

The fourth proportional to 20,129.20, 30,218.10 and 19,983.40 is: 29,999.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,129.20 : 30,218.10 = 19,983.40 : x
  2. Step 2: Convert to fraction form
    20,129.20/30,218.10 = 19,983.40/x
  3. Step 3: Cross multiply
    20,129.20x = 30,218.10 × 19,983.40
  4. Step 4: Simplify right side
    20,129.20x = 603,860,379.54
  5. Step 5: Solve for x
    x = 603,860,379.54/20,129.20
  6. Step 6: Final answer
    x = 29,999.22

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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.