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Finding the Fourth Proportional to 72,489.80, 108,561.90 and 72,489.80

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Solution

The fourth proportional to 72,489.80, 108,561.90 and 72,489.80 is: 108,561.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,489.80 : 108,561.90 = 72,489.80 : x
  2. Step 2: Convert to fraction form
    72,489.80/108,561.90 = 72,489.80/x
  3. Step 3: Cross multiply
    72,489.80x = 108,561.90 × 72,489.80
  4. Step 4: Simplify right side
    72,489.80x = 7,869,630,418.62
  5. Step 5: Solve for x
    x = 7,869,630,418.62/72,489.80
  6. Step 6: Final answer
    x = 108,561.90

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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.