Home / 20,828.34-28,780.11-18,171.54

Finding the Fourth Proportional to 20,828.34, 28,780.11 and 18,171.54

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Solution

The fourth proportional to 20,828.34, 28,780.11 and 18,171.54 is: 25,109.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,828.34 : 28,780.11 = 18,171.54 : x
  2. Step 2: Convert to fraction form
    20,828.34/28,780.11 = 18,171.54/x
  3. Step 3: Cross multiply
    20,828.34x = 28,780.11 × 18,171.54
  4. Step 4: Simplify right side
    20,828.34x = 522,978,920.07
  5. Step 5: Solve for x
    x = 522,978,920.07/20,828.34
  6. Step 6: Final answer
    x = 25,109.01

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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.