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Finding the Fourth Proportional to 70,611.75, 105,917.54 and 18,021.24

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Solution

The fourth proportional to 70,611.75, 105,917.54 and 18,021.24 is: 27,031.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,611.75 : 105,917.54 = 18,021.24 : x
  2. Step 2: Convert to fraction form
    70,611.75/105,917.54 = 18,021.24/x
  3. Step 3: Cross multiply
    70,611.75x = 105,917.54 × 18,021.24
  4. Step 4: Simplify right side
    70,611.75x = 1,908,765,318.44
  5. Step 5: Solve for x
    x = 1,908,765,318.44/70,611.75
  6. Step 6: Final answer
    x = 27,031.84

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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.