Home / 20,131.20-30,221.10-19,985.40

Finding the Fourth Proportional to 20,131.20, 30,221.10 and 19,985.40

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Solution

The fourth proportional to 20,131.20, 30,221.10 and 19,985.40 is: 30,002.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,131.20 : 30,221.10 = 19,985.40 : x
  2. Step 2: Convert to fraction form
    20,131.20/30,221.10 = 19,985.40/x
  3. Step 3: Cross multiply
    20,131.20x = 30,221.10 × 19,985.40
  4. Step 4: Simplify right side
    20,131.20x = 603,980,771.94
  5. Step 5: Solve for x
    x = 603,980,771.94/20,131.20
  6. Step 6: Final answer
    x = 30,002.22

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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.