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Finding the Fourth Proportional to 72,608.31, 100,199.87 and 40,342.97

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Solution

The fourth proportional to 72,608.31, 100,199.87 and 40,342.97 is: 55,673.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,608.31 : 100,199.87 = 40,342.97 : x
  2. Step 2: Convert to fraction form
    72,608.31/100,199.87 = 40,342.97/x
  3. Step 3: Cross multiply
    72,608.31x = 100,199.87 × 40,342.97
  4. Step 4: Simplify right side
    72,608.31x = 4,042,360,549.48
  5. Step 5: Solve for x
    x = 4,042,360,549.48/72,608.31
  6. Step 6: Final answer
    x = 55,673.52

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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.