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Finding the Fourth Proportional to 18,480.20, 27,720.30 and 5,331.40

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Solution

The fourth proportional to 18,480.20, 27,720.30 and 5,331.40 is: 7,997.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,480.20 : 27,720.30 = 5,331.40 : x
  2. Step 2: Convert to fraction form
    18,480.20/27,720.30 = 5,331.40/x
  3. Step 3: Cross multiply
    18,480.20x = 27,720.30 × 5,331.40
  4. Step 4: Simplify right side
    18,480.20x = 147,788,007.42
  5. Step 5: Solve for x
    x = 147,788,007.42/18,480.20
  6. Step 6: Final answer
    x = 7,997.10

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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.