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Finding the Fourth Proportional to 72,169.02, 99,593.91 and 39,903.21

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Solution

The fourth proportional to 72,169.02, 99,593.91 and 39,903.21 is: 55,066.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,169.02 : 99,593.91 = 39,903.21 : x
  2. Step 2: Convert to fraction form
    72,169.02/99,593.91 = 39,903.21/x
  3. Step 3: Cross multiply
    72,169.02x = 99,593.91 × 39,903.21
  4. Step 4: Simplify right side
    72,169.02x = 3,974,116,705.45
  5. Step 5: Solve for x
    x = 3,974,116,705.45/72,169.02
  6. Step 6: Final answer
    x = 55,066.80

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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.