Home / 80,579.64-120,858.30-21,420.12

Finding the Fourth Proportional to 80,579.64, 120,858.30 and 21,420.12

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Solution

The fourth proportional to 80,579.64, 120,858.30 and 21,420.12 is: 32,127.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,579.64 : 120,858.30 = 21,420.12 : x
  2. Step 2: Convert to fraction form
    80,579.64/120,858.30 = 21,420.12/x
  3. Step 3: Cross multiply
    80,579.64x = 120,858.30 × 21,420.12
  4. Step 4: Simplify right side
    80,579.64x = 2,588,799,289.00
  5. Step 5: Solve for x
    x = 2,588,799,289.00/80,579.64
  6. Step 6: Final answer
    x = 32,127.21

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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.