Home / 12,619.80-18,929.70-8,731.80

Finding the Fourth Proportional to 12,619.80, 18,929.70 and 8,731.80

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Solution

The fourth proportional to 12,619.80, 18,929.70 and 8,731.80 is: 13,097.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,619.80 : 18,929.70 = 8,731.80 : x
  2. Step 2: Convert to fraction form
    12,619.80/18,929.70 = 8,731.80/x
  3. Step 3: Cross multiply
    12,619.80x = 18,929.70 × 8,731.80
  4. Step 4: Simplify right side
    12,619.80x = 165,290,354.46
  5. Step 5: Solve for x
    x = 165,290,354.46/12,619.80
  6. Step 6: Final answer
    x = 13,097.70

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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.