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Finding the Fourth Proportional to 73,145.87, 109,722.90 and 20,551.25

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Solution

The fourth proportional to 73,145.87, 109,722.90 and 20,551.25 is: 30,828.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,145.87 : 109,722.90 = 20,551.25 : x
  2. Step 2: Convert to fraction form
    73,145.87/109,722.90 = 20,551.25/x
  3. Step 3: Cross multiply
    73,145.87x = 109,722.90 × 20,551.25
  4. Step 4: Simplify right side
    73,145.87x = 2,254,942,748.63
  5. Step 5: Solve for x
    x = 2,254,942,748.63/73,145.87
  6. Step 6: Final answer
    x = 30,828.03

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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.