Home / 20,780.42-28,676.84-12,822.62

Finding the Fourth Proportional to 20,780.42, 28,676.84 and 12,822.62

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Solution

The fourth proportional to 20,780.42, 28,676.84 and 12,822.62 is: 17,695.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.42 : 28,676.84 = 12,822.62 : x
  2. Step 2: Convert to fraction form
    20,780.42/28,676.84 = 12,822.62/x
  3. Step 3: Cross multiply
    20,780.42x = 28,676.84 × 12,822.62
  4. Step 4: Simplify right side
    20,780.42x = 367,712,222.12
  5. Step 5: Solve for x
    x = 367,712,222.12/20,780.42
  6. Step 6: Final answer
    x = 17,695.13

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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.