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Finding the Fourth Proportional to 102,990.20, 154,485.30 and 80,871.80

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Solution

The fourth proportional to 102,990.20, 154,485.30 and 80,871.80 is: 121,307.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,990.20 : 154,485.30 = 80,871.80 : x
  2. Step 2: Convert to fraction form
    102,990.20/154,485.30 = 80,871.80/x
  3. Step 3: Cross multiply
    102,990.20x = 154,485.30 × 80,871.80
  4. Step 4: Simplify right side
    102,990.20x = 12,493,504,284.54
  5. Step 5: Solve for x
    x = 12,493,504,284.54/102,990.20
  6. Step 6: Final answer
    x = 121,307.70

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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.