Home / 18,961.78-28,430.50-7,876.12

Finding the Fourth Proportional to 18,961.78, 28,430.50 and 7,876.12

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Solution

The fourth proportional to 18,961.78, 28,430.50 and 7,876.12 is: 11,809.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,961.78 : 28,430.50 = 7,876.12 : x
  2. Step 2: Convert to fraction form
    18,961.78/28,430.50 = 7,876.12/x
  3. Step 3: Cross multiply
    18,961.78x = 28,430.50 × 7,876.12
  4. Step 4: Simplify right side
    18,961.78x = 223,922,029.66
  5. Step 5: Solve for x
    x = 223,922,029.66/18,961.78
  6. Step 6: Final answer
    x = 11,809.12

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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.