Home / 20,887.56-31,309.20-12,989.88

Finding the Fourth Proportional to 20,887.56, 31,309.20 and 12,989.88

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Solution

The fourth proportional to 20,887.56, 31,309.20 and 12,989.88 is: 19,471.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,887.56 : 31,309.20 = 12,989.88 : x
  2. Step 2: Convert to fraction form
    20,887.56/31,309.20 = 12,989.88/x
  3. Step 3: Cross multiply
    20,887.56x = 31,309.20 × 12,989.88
  4. Step 4: Simplify right side
    20,887.56x = 406,702,750.90
  5. Step 5: Solve for x
    x = 406,702,750.90/20,887.56
  6. Step 6: Final answer
    x = 19,471.05

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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.