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Finding the Fourth Proportional to 80,580.39, 120,859.43 and 21,420.87

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Solution

The fourth proportional to 80,580.39, 120,859.43 and 21,420.87 is: 32,128.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,580.39 : 120,859.43 = 21,420.87 : x
  2. Step 2: Convert to fraction form
    80,580.39/120,859.43 = 21,420.87/x
  3. Step 3: Cross multiply
    80,580.39x = 120,859.43 × 21,420.87
  4. Step 4: Simplify right side
    80,580.39x = 2,588,914,031.20
  5. Step 5: Solve for x
    x = 2,588,914,031.20/80,580.39
  6. Step 6: Final answer
    x = 32,128.34

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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.