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Finding the Fourth Proportional to 73,912.70, 101,999.50 and 39,921.18

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Solution

The fourth proportional to 73,912.70, 101,999.50 and 39,921.18 is: 55,091.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,912.70 : 101,999.50 = 39,921.18 : x
  2. Step 2: Convert to fraction form
    73,912.70/101,999.50 = 39,921.18/x
  3. Step 3: Cross multiply
    73,912.70x = 101,999.50 × 39,921.18
  4. Step 4: Simplify right side
    73,912.70x = 4,071,939,917.11
  5. Step 5: Solve for x
    x = 4,071,939,917.11/73,912.70
  6. Step 6: Final answer
    x = 55,091.21

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1.5x scale

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.