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Finding the Fourth Proportional to 72,991.72, 100,728.30 and 39,457.72

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Solution

The fourth proportional to 72,991.72, 100,728.30 and 39,457.72 is: 54,451.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,991.72 : 100,728.30 = 39,457.72 : x
  2. Step 2: Convert to fraction form
    72,991.72/100,728.30 = 39,457.72/x
  3. Step 3: Cross multiply
    72,991.72x = 100,728.30 × 39,457.72
  4. Step 4: Simplify right side
    72,991.72x = 3,974,509,057.48
  5. Step 5: Solve for x
    x = 3,974,509,057.48/72,991.72
  6. Step 6: Final answer
    x = 54,451.51

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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.