Home / 20,856.78-28,782.24-11,904.42

Finding the Fourth Proportional to 20,856.78, 28,782.24 and 11,904.42

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Solution

The fourth proportional to 20,856.78, 28,782.24 and 11,904.42 is: 16,428.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.78 : 28,782.24 = 11,904.42 : x
  2. Step 2: Convert to fraction form
    20,856.78/28,782.24 = 11,904.42/x
  3. Step 3: Cross multiply
    20,856.78x = 28,782.24 × 11,904.42
  4. Step 4: Simplify right side
    20,856.78x = 342,635,873.50
  5. Step 5: Solve for x
    x = 342,635,873.50/20,856.78
  6. Step 6: Final answer
    x = 16,428.03

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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.