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Finding the Fourth Proportional to 72,805.92, 109,165.80 and 28,380.80

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Solution

The fourth proportional to 72,805.92, 109,165.80 and 28,380.80 is: 42,554.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,805.92 : 109,165.80 = 28,380.80 : x
  2. Step 2: Convert to fraction form
    72,805.92/109,165.80 = 28,380.80/x
  3. Step 3: Cross multiply
    72,805.92x = 109,165.80 × 28,380.80
  4. Step 4: Simplify right side
    72,805.92x = 3,098,212,736.64
  5. Step 5: Solve for x
    x = 3,098,212,736.64/72,805.92
  6. Step 6: Final answer
    x = 42,554.41

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1.5x scale

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.