Home / 20,912.79-28,858.67-11,352.47

Finding the Fourth Proportional to 20,912.79, 28,858.67 and 11,352.47

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Solution

The fourth proportional to 20,912.79, 28,858.67 and 11,352.47 is: 15,665.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.79 : 28,858.67 = 11,352.47 : x
  2. Step 2: Convert to fraction form
    20,912.79/28,858.67 = 11,352.47/x
  3. Step 3: Cross multiply
    20,912.79x = 28,858.67 × 11,352.47
  4. Step 4: Simplify right side
    20,912.79x = 327,616,984.36
  5. Step 5: Solve for x
    x = 327,616,984.36/20,912.79
  6. Step 6: Final answer
    x = 15,665.87

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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.