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Finding the Fourth Proportional to 18,086.40, 27,129.60 and 13,190.40

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Solution

The fourth proportional to 18,086.40, 27,129.60 and 13,190.40 is: 19,785.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,086.40 : 27,129.60 = 13,190.40 : x
  2. Step 2: Convert to fraction form
    18,086.40/27,129.60 = 13,190.40/x
  3. Step 3: Cross multiply
    18,086.40x = 27,129.60 × 13,190.40
  4. Step 4: Simplify right side
    18,086.40x = 357,850,275.84
  5. Step 5: Solve for x
    x = 357,850,275.84/18,086.40
  6. Step 6: Final answer
    x = 19,785.60

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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.