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Finding the Fourth Proportional to 18,108.64, 27,164.40 and 7,720.48

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Solution

The fourth proportional to 18,108.64, 27,164.40 and 7,720.48 is: 11,581.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,108.64 : 27,164.40 = 7,720.48 : x
  2. Step 2: Convert to fraction form
    18,108.64/27,164.40 = 7,720.48/x
  3. Step 3: Cross multiply
    18,108.64x = 27,164.40 × 7,720.48
  4. Step 4: Simplify right side
    18,108.64x = 209,722,206.91
  5. Step 5: Solve for x
    x = 209,722,206.91/18,108.64
  6. Step 6: Final answer
    x = 11,581.33

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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.