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Finding the Fourth Proportional to 72,741.57, 100,379.70 and 40,908.57

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Solution

The fourth proportional to 72,741.57, 100,379.70 and 40,908.57 is: 56,451.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,741.57 : 100,379.70 = 40,908.57 : x
  2. Step 2: Convert to fraction form
    72,741.57/100,379.70 = 40,908.57/x
  3. Step 3: Cross multiply
    72,741.57x = 100,379.70 × 40,908.57
  4. Step 4: Simplify right side
    72,741.57x = 4,106,389,984.03
  5. Step 5: Solve for x
    x = 4,106,389,984.03/72,741.57
  6. Step 6: Final answer
    x = 56,451.76

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1.5x scale

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.