Home / 20,912.85-28,905.66-18,375.93

Finding the Fourth Proportional to 20,912.85, 28,905.66 and 18,375.93

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Solution

The fourth proportional to 20,912.85, 28,905.66 and 18,375.93 is: 25,399.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.85 : 28,905.66 = 18,375.93 : x
  2. Step 2: Convert to fraction form
    20,912.85/28,905.66 = 18,375.93/x
  3. Step 3: Cross multiply
    20,912.85x = 28,905.66 × 18,375.93
  4. Step 4: Simplify right side
    20,912.85x = 531,168,384.76
  5. Step 5: Solve for x
    x = 531,168,384.76/20,912.85
  6. Step 6: Final answer
    x = 25,399.14

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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.