Home / 20,579.72-28,399.92-11,148.31

Finding the Fourth Proportional to 20,579.72, 28,399.92 and 11,148.31

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Solution

The fourth proportional to 20,579.72, 28,399.92 and 11,148.31 is: 15,384.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,579.72 : 28,399.92 = 11,148.31 : x
  2. Step 2: Convert to fraction form
    20,579.72/28,399.92 = 11,148.31/x
  3. Step 3: Cross multiply
    20,579.72x = 28,399.92 × 11,148.31
  4. Step 4: Simplify right side
    20,579.72x = 316,611,112.14
  5. Step 5: Solve for x
    x = 316,611,112.14/20,579.72
  6. Step 6: Final answer
    x = 15,384.62

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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.