Home / 72,743.20-100,380-40,905.76

Finding the Fourth Proportional to 72,743.20, 100,380 and 40,905.76

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Solution

The fourth proportional to 72,743.20, 100,380 and 40,905.76 is: 56,446.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,743.20 : 100,380 = 40,905.76 : x
  2. Step 2: Convert to fraction form
    72,743.20/100,380 = 40,905.76/x
  3. Step 3: Cross multiply
    72,743.20x = 100,380 × 40,905.76
  4. Step 4: Simplify right side
    72,743.20x = 4,106,120,188.80
  5. Step 5: Solve for x
    x = 4,106,120,188.80/72,743.20
  6. Step 6: Final answer
    x = 56,446.79

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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.