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Finding the Fourth Proportional to 70,620.96, 105,931.44 and 18,028.56

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Solution

The fourth proportional to 70,620.96, 105,931.44 and 18,028.56 is: 27,042.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,620.96 : 105,931.44 = 18,028.56 : x
  2. Step 2: Convert to fraction form
    70,620.96/105,931.44 = 18,028.56/x
  3. Step 3: Cross multiply
    70,620.96x = 105,931.44 × 18,028.56
  4. Step 4: Simplify right side
    70,620.96x = 1,909,791,321.93
  5. Step 5: Solve for x
    x = 1,909,791,321.93/70,620.96
  6. Step 6: Final answer
    x = 27,042.84

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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.