Home / 18,780.72-28,159.76-12,930.96

Finding the Fourth Proportional to 18,780.72, 28,159.76 and 12,930.96

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Solution

The fourth proportional to 18,780.72, 28,159.76 and 12,930.96 is: 19,388.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,780.72 : 28,159.76 = 12,930.96 : x
  2. Step 2: Convert to fraction form
    18,780.72/28,159.76 = 12,930.96/x
  3. Step 3: Cross multiply
    18,780.72x = 28,159.76 × 12,930.96
  4. Step 4: Simplify right side
    18,780.72x = 364,132,730.17
  5. Step 5: Solve for x
    x = 364,132,730.17/18,780.72
  6. Step 6: Final answer
    x = 19,388.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.