Home / 20,788.56-31,155.84-15,840

Finding the Fourth Proportional to 20,788.56, 31,155.84 and 15,840

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Solution

The fourth proportional to 20,788.56, 31,155.84 and 15,840 is: 23,739.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,788.56 : 31,155.84 = 15,840 : x
  2. Step 2: Convert to fraction form
    20,788.56/31,155.84 = 15,840/x
  3. Step 3: Cross multiply
    20,788.56x = 31,155.84 × 15,840
  4. Step 4: Simplify right side
    20,788.56x = 493,508,505.60
  5. Step 5: Solve for x
    x = 493,508,505.60/20,788.56
  6. Step 6: Final answer
    x = 23,739.43

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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.