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Finding the Fourth Proportional to 19,900.20, 29,850.30 and 5,109.60

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Solution

The fourth proportional to 19,900.20, 29,850.30 and 5,109.60 is: 7,664.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,900.20 : 29,850.30 = 5,109.60 : x
  2. Step 2: Convert to fraction form
    19,900.20/29,850.30 = 5,109.60/x
  3. Step 3: Cross multiply
    19,900.20x = 29,850.30 × 5,109.60
  4. Step 4: Simplify right side
    19,900.20x = 152,523,092.88
  5. Step 5: Solve for x
    x = 152,523,092.88/19,900.20
  6. Step 6: Final answer
    x = 7,664.40

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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.