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Finding the Fourth Proportional to 18,102.80, 27,129.90 and 12,902.60

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Solution

The fourth proportional to 18,102.80, 27,129.90 and 12,902.60 is: 19,336.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,102.80 : 27,129.90 = 12,902.60 : x
  2. Step 2: Convert to fraction form
    18,102.80/27,129.90 = 12,902.60/x
  3. Step 3: Cross multiply
    18,102.80x = 27,129.90 × 12,902.60
  4. Step 4: Simplify right side
    18,102.80x = 350,046,247.74
  5. Step 5: Solve for x
    x = 350,046,247.74/18,102.80
  6. Step 6: Final answer
    x = 19,336.58

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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.