Home / 20,988.30-31,528.66-12,673.27

Finding the Fourth Proportional to 20,988.30, 31,528.66 and 12,673.27

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Solution

The fourth proportional to 20,988.30, 31,528.66 and 12,673.27 is: 19,037.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.30 : 31,528.66 = 12,673.27 : x
  2. Step 2: Convert to fraction form
    20,988.30/31,528.66 = 12,673.27/x
  3. Step 3: Cross multiply
    20,988.30x = 31,528.66 × 12,673.27
  4. Step 4: Simplify right side
    20,988.30x = 399,571,220.92
  5. Step 5: Solve for x
    x = 399,571,220.92/20,988.30
  6. Step 6: Final answer
    x = 19,037.81

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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.