Home / 20,579.78-28,400.07-11,148.38

Finding the Fourth Proportional to 20,579.78, 28,400.07 and 11,148.38

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Solution

The fourth proportional to 20,579.78, 28,400.07 and 11,148.38 is: 15,384.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,579.78 : 28,400.07 = 11,148.38 : x
  2. Step 2: Convert to fraction form
    20,579.78/28,400.07 = 11,148.38/x
  3. Step 3: Cross multiply
    20,579.78x = 28,400.07 × 11,148.38
  4. Step 4: Simplify right side
    20,579.78x = 316,614,772.39
  5. Step 5: Solve for x
    x = 316,614,772.39/20,579.78
  6. Step 6: Final answer
    x = 15,384.75

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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.