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Finding the Fourth Proportional to 72,991.80, 109,487.70 and 45,343.80

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Solution

The fourth proportional to 72,991.80, 109,487.70 and 45,343.80 is: 68,015.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,991.80 : 109,487.70 = 45,343.80 : x
  2. Step 2: Convert to fraction form
    72,991.80/109,487.70 = 45,343.80/x
  3. Step 3: Cross multiply
    72,991.80x = 109,487.70 × 45,343.80
  4. Step 4: Simplify right side
    72,991.80x = 4,964,588,371.26
  5. Step 5: Solve for x
    x = 4,964,588,371.26/72,991.80
  6. Step 6: Final answer
    x = 68,015.70

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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.