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Finding the Fourth Proportional to 70,611.87, 105,917.72 and 18,021.36

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Solution

The fourth proportional to 70,611.87, 105,917.72 and 18,021.36 is: 27,032.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,611.87 : 105,917.72 = 18,021.36 : x
  2. Step 2: Convert to fraction form
    70,611.87/105,917.72 = 18,021.36/x
  3. Step 3: Cross multiply
    70,611.87x = 105,917.72 × 18,021.36
  4. Step 4: Simplify right side
    70,611.87x = 1,908,781,362.50
  5. Step 5: Solve for x
    x = 1,908,781,362.50/70,611.87
  6. Step 6: Final answer
    x = 27,032.02

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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.