Home / 20,828.86-28,742.40-11,876.74

Finding the Fourth Proportional to 20,828.86, 28,742.40 and 11,876.74

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Solution

The fourth proportional to 20,828.86, 28,742.40 and 11,876.74 is: 16,389.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,828.86 : 28,742.40 = 11,876.74 : x
  2. Step 2: Convert to fraction form
    20,828.86/28,742.40 = 11,876.74/x
  3. Step 3: Cross multiply
    20,828.86x = 28,742.40 × 11,876.74
  4. Step 4: Simplify right side
    20,828.86x = 341,366,011.78
  5. Step 5: Solve for x
    x = 341,366,011.78/20,828.86
  6. Step 6: Final answer
    x = 16,389.09

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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.