Home / 20,991.57-31,333.79-18,500.52

Finding the Fourth Proportional to 20,991.57, 31,333.79 and 18,500.52

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Solution

The fourth proportional to 20,991.57, 31,333.79 and 18,500.52 is: 27,615.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.57 : 31,333.79 = 18,500.52 : x
  2. Step 2: Convert to fraction form
    20,991.57/31,333.79 = 18,500.52/x
  3. Step 3: Cross multiply
    20,991.57x = 31,333.79 × 18,500.52
  4. Step 4: Simplify right side
    20,991.57x = 579,691,316.07
  5. Step 5: Solve for x
    x = 579,691,316.07/20,991.57
  6. Step 6: Final answer
    x = 27,615.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.