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Finding the Fourth Proportional to 19,997.60, 29,996.40 and 12,221.60

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Solution

The fourth proportional to 19,997.60, 29,996.40 and 12,221.60 is: 18,332.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,997.60 : 29,996.40 = 12,221.60 : x
  2. Step 2: Convert to fraction form
    19,997.60/29,996.40 = 12,221.60/x
  3. Step 3: Cross multiply
    19,997.60x = 29,996.40 × 12,221.60
  4. Step 4: Simplify right side
    19,997.60x = 366,604,002.24
  5. Step 5: Solve for x
    x = 366,604,002.24/19,997.60
  6. Step 6: Final answer
    x = 18,332.40

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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.