Home / 20,856.45-28,782.62-11,425.02

Finding the Fourth Proportional to 20,856.45, 28,782.62 and 11,425.02

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Solution

The fourth proportional to 20,856.45, 28,782.62 and 11,425.02 is: 15,766.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.45 : 28,782.62 = 11,425.02 : x
  2. Step 2: Convert to fraction form
    20,856.45/28,782.62 = 11,425.02/x
  3. Step 3: Cross multiply
    20,856.45x = 28,782.62 × 11,425.02
  4. Step 4: Simplify right side
    20,856.45x = 328,841,951.20
  5. Step 5: Solve for x
    x = 328,841,951.20/20,856.45
  6. Step 6: Final answer
    x = 15,766.92

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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.