Home / 20,971.64-31,431.12-12,544.36

Finding the Fourth Proportional to 20,971.64, 31,431.12 and 12,544.36

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Solution

The fourth proportional to 20,971.64, 31,431.12 and 12,544.36 is: 18,800.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.64 : 31,431.12 = 12,544.36 : x
  2. Step 2: Convert to fraction form
    20,971.64/31,431.12 = 12,544.36/x
  3. Step 3: Cross multiply
    20,971.64x = 31,431.12 × 12,544.36
  4. Step 4: Simplify right side
    20,971.64x = 394,283,323.77
  5. Step 5: Solve for x
    x = 394,283,323.77/20,971.64
  6. Step 6: Final answer
    x = 18,800.79

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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.