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Finding the Fourth Proportional to 73,187.78, 100,999.50 and 39,653.78

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Solution

The fourth proportional to 73,187.78, 100,999.50 and 39,653.78 is: 54,722.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,187.78 : 100,999.50 = 39,653.78 : x
  2. Step 2: Convert to fraction form
    73,187.78/100,999.50 = 39,653.78/x
  3. Step 3: Cross multiply
    73,187.78x = 100,999.50 × 39,653.78
  4. Step 4: Simplify right side
    73,187.78x = 4,005,011,953.11
  5. Step 5: Solve for x
    x = 4,005,011,953.11/73,187.78
  6. Step 6: Final answer
    x = 54,722.41

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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.