Home / 20,780.31-28,676.39-11,348.91

Finding the Fourth Proportional to 20,780.31, 28,676.39 and 11,348.91

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Solution

The fourth proportional to 20,780.31, 28,676.39 and 11,348.91 is: 15,661.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.31 : 28,676.39 = 11,348.91 : x
  2. Step 2: Convert to fraction form
    20,780.31/28,676.39 = 11,348.91/x
  3. Step 3: Cross multiply
    20,780.31x = 28,676.39 × 11,348.91
  4. Step 4: Simplify right side
    20,780.31x = 325,445,712.49
  5. Step 5: Solve for x
    x = 325,445,712.49/20,780.31
  6. Step 6: Final answer
    x = 15,661.25

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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.