Home / 20,830.77-28,747.17-11,399.31

Finding the Fourth Proportional to 20,830.77, 28,747.17 and 11,399.31

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Solution

The fourth proportional to 20,830.77, 28,747.17 and 11,399.31 is: 15,731.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,830.77 : 28,747.17 = 11,399.31 : x
  2. Step 2: Convert to fraction form
    20,830.77/28,747.17 = 11,399.31/x
  3. Step 3: Cross multiply
    20,830.77x = 28,747.17 × 11,399.31
  4. Step 4: Simplify right side
    20,830.77x = 327,697,902.45
  5. Step 5: Solve for x
    x = 327,697,902.45/20,830.77
  6. Step 6: Final answer
    x = 15,731.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.