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Finding the Fourth Proportional to 18,318.76, 27,482.36 and 7,789.12

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Solution

The fourth proportional to 18,318.76, 27,482.36 and 7,789.12 is: 11,685.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,318.76 : 27,482.36 = 7,789.12 : x
  2. Step 2: Convert to fraction form
    18,318.76/27,482.36 = 7,789.12/x
  3. Step 3: Cross multiply
    18,318.76x = 27,482.36 × 7,789.12
  4. Step 4: Simplify right side
    18,318.76x = 214,063,399.92
  5. Step 5: Solve for x
    x = 214,063,399.92/18,318.76
  6. Step 6: Final answer
    x = 11,685.47

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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.