Home / 20,856.09-28,780.29-11,422.83

Finding the Fourth Proportional to 20,856.09, 28,780.29 and 11,422.83

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Solution

The fourth proportional to 20,856.09, 28,780.29 and 11,422.83 is: 15,762.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.09 : 28,780.29 = 11,422.83 : x
  2. Step 2: Convert to fraction form
    20,856.09/28,780.29 = 11,422.83/x
  3. Step 3: Cross multiply
    20,856.09x = 28,780.29 × 11,422.83
  4. Step 4: Simplify right side
    20,856.09x = 328,752,360.02
  5. Step 5: Solve for x
    x = 328,752,360.02/20,856.09
  6. Step 6: Final answer
    x = 15,762.90

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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.