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Finding the Fourth Proportional to 143,438.80, 215,158.20 and 120,629.20

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Solution

The fourth proportional to 143,438.80, 215,158.20 and 120,629.20 is: 180,943.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,438.80 : 215,158.20 = 120,629.20 : x
  2. Step 2: Convert to fraction form
    143,438.80/215,158.20 = 120,629.20/x
  3. Step 3: Cross multiply
    143,438.80x = 215,158.20 × 120,629.20
  4. Step 4: Simplify right side
    143,438.80x = 25,954,361,539.44
  5. Step 5: Solve for x
    x = 25,954,361,539.44/143,438.80
  6. Step 6: Final answer
    x = 180,943.80

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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.