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Finding the Fourth Proportional to 20,130.20, 30,209.70 and 11,355.80

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Solution

The fourth proportional to 20,130.20, 30,209.70 and 11,355.80 is: 17,041.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,130.20 : 30,209.70 = 11,355.80 : x
  2. Step 2: Convert to fraction form
    20,130.20/30,209.70 = 11,355.80/x
  3. Step 3: Cross multiply
    20,130.20x = 30,209.70 × 11,355.80
  4. Step 4: Simplify right side
    20,130.20x = 343,055,311.26
  5. Step 5: Solve for x
    x = 343,055,311.26/20,130.20
  6. Step 6: Final answer
    x = 17,041.82

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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.