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Finding the Fourth Proportional to 20,089.80, 30,129.30 and 8,400.60

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Solution

The fourth proportional to 20,089.80, 30,129.30 and 8,400.60 is: 12,598.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,089.80 : 30,129.30 = 8,400.60 : x
  2. Step 2: Convert to fraction form
    20,089.80/30,129.30 = 8,400.60/x
  3. Step 3: Cross multiply
    20,089.80x = 30,129.30 × 8,400.60
  4. Step 4: Simplify right side
    20,089.80x = 253,104,197.58
  5. Step 5: Solve for x
    x = 253,104,197.58/20,089.80
  6. Step 6: Final answer
    x = 12,598.64

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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.