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Finding the Fourth Proportional to 18,612.40, 27,921.60 and 6,128.80

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Solution

The fourth proportional to 18,612.40, 27,921.60 and 6,128.80 is: 9,194.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,612.40 : 27,921.60 = 6,128.80 : x
  2. Step 2: Convert to fraction form
    18,612.40/27,921.60 = 6,128.80/x
  3. Step 3: Cross multiply
    18,612.40x = 27,921.60 × 6,128.80
  4. Step 4: Simplify right side
    18,612.40x = 171,125,902.08
  5. Step 5: Solve for x
    x = 171,125,902.08/18,612.40
  6. Step 6: Final answer
    x = 9,194.19

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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.