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Finding the Fourth Proportional to 20,122.80, 30,172.20 and 12,337.20

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Solution

The fourth proportional to 20,122.80, 30,172.20 and 12,337.20 is: 18,498.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,122.80 : 30,172.20 = 12,337.20 : x
  2. Step 2: Convert to fraction form
    20,122.80/30,172.20 = 12,337.20/x
  3. Step 3: Cross multiply
    20,122.80x = 30,172.20 × 12,337.20
  4. Step 4: Simplify right side
    20,122.80x = 372,240,465.84
  5. Step 5: Solve for x
    x = 372,240,465.84/20,122.80
  6. Step 6: Final answer
    x = 18,498.44

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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.