Home / 21,144.60-31,731.42-20,980.56

Finding the Fourth Proportional to 21,144.60, 31,731.42 and 20,980.56

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Solution

The fourth proportional to 21,144.60, 31,731.42 and 20,980.56 is: 31,485.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,144.60 : 31,731.42 = 20,980.56 : x
  2. Step 2: Convert to fraction form
    21,144.60/31,731.42 = 20,980.56/x
  3. Step 3: Cross multiply
    21,144.60x = 31,731.42 × 20,980.56
  4. Step 4: Simplify right side
    21,144.60x = 665,742,961.20
  5. Step 5: Solve for x
    x = 665,742,961.20/21,144.60
  6. Step 6: Final answer
    x = 31,485.25

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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.