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Finding the Fourth Proportional to 143,290.76, 215,102.20 and 76,860.64

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Solution

The fourth proportional to 143,290.76, 215,102.20 and 76,860.64 is: 115,380.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,290.76 : 215,102.20 = 76,860.64 : x
  2. Step 2: Convert to fraction form
    143,290.76/215,102.20 = 76,860.64/x
  3. Step 3: Cross multiply
    143,290.76x = 215,102.20 × 76,860.64
  4. Step 4: Simplify right side
    143,290.76x = 16,532,892,757.41
  5. Step 5: Solve for x
    x = 16,532,892,757.41/143,290.76
  6. Step 6: Final answer
    x = 115,380.03

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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.