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Finding the Fourth Proportional to 20,129.80, 30,213.90 and 17,211.40

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Solution

The fourth proportional to 20,129.80, 30,213.90 and 17,211.40 is: 25,833.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,129.80 : 30,213.90 = 17,211.40 : x
  2. Step 2: Convert to fraction form
    20,129.80/30,213.90 = 17,211.40/x
  3. Step 3: Cross multiply
    20,129.80x = 30,213.90 × 17,211.40
  4. Step 4: Simplify right side
    20,129.80x = 520,023,518.46
  5. Step 5: Solve for x
    x = 520,023,518.46/20,129.80
  6. Step 6: Final answer
    x = 25,833.52

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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.