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Finding the Fourth Proportional to 72,723.80, 108,999.30 and 30,603.80

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Solution

The fourth proportional to 72,723.80, 108,999.30 and 30,603.80 is: 45,869.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,723.80 : 108,999.30 = 30,603.80 : x
  2. Step 2: Convert to fraction form
    72,723.80/108,999.30 = 30,603.80/x
  3. Step 3: Cross multiply
    72,723.80x = 108,999.30 × 30,603.80
  4. Step 4: Simplify right side
    72,723.80x = 3,335,792,777.34
  5. Step 5: Solve for x
    x = 3,335,792,777.34/72,723.80
  6. Step 6: Final answer
    x = 45,869.34

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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.