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Finding the Fourth Proportional to 57,438.60, 86,170.02 and 28,991.76

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Solution

The fourth proportional to 57,438.60, 86,170.02 and 28,991.76 is: 43,493.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,438.60 : 86,170.02 = 28,991.76 : x
  2. Step 2: Convert to fraction form
    57,438.60/86,170.02 = 28,991.76/x
  3. Step 3: Cross multiply
    57,438.60x = 86,170.02 × 28,991.76
  4. Step 4: Simplify right side
    57,438.60x = 2,498,220,539.04
  5. Step 5: Solve for x
    x = 2,498,220,539.04/57,438.60
  6. Step 6: Final answer
    x = 43,493.76

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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.