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Finding the Fourth Proportional to 72,917.20, 109,157.10 and 43,319.80

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Solution

The fourth proportional to 72,917.20, 109,157.10 and 43,319.80 is: 64,849.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,917.20 : 109,157.10 = 43,319.80 : x
  2. Step 2: Convert to fraction form
    72,917.20/109,157.10 = 43,319.80/x
  3. Step 3: Cross multiply
    72,917.20x = 109,157.10 × 43,319.80
  4. Step 4: Simplify right side
    72,917.20x = 4,728,663,740.58
  5. Step 5: Solve for x
    x = 4,728,663,740.58/72,917.20
  6. Step 6: Final answer
    x = 64,849.77

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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.