Home / 20,105.78-30,135.99-9,705.38

Finding the Fourth Proportional to 20,105.78, 30,135.99 and 9,705.38

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Solution

The fourth proportional to 20,105.78, 30,135.99 and 9,705.38 is: 14,547.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,105.78 : 30,135.99 = 9,705.38 : x
  2. Step 2: Convert to fraction form
    20,105.78/30,135.99 = 9,705.38/x
  3. Step 3: Cross multiply
    20,105.78x = 30,135.99 × 9,705.38
  4. Step 4: Simplify right side
    20,105.78x = 292,481,234.63
  5. Step 5: Solve for x
    x = 292,481,234.63/20,105.78
  6. Step 6: Final answer
    x = 14,547.12

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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.