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Finding the Fourth Proportional to 72,539.68, 100,079.76 and 40,704.16

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Solution

The fourth proportional to 72,539.68, 100,079.76 and 40,704.16 is: 56,157.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,539.68 : 100,079.76 = 40,704.16 : x
  2. Step 2: Convert to fraction form
    72,539.68/100,079.76 = 40,704.16/x
  3. Step 3: Cross multiply
    72,539.68x = 100,079.76 × 40,704.16
  4. Step 4: Simplify right side
    72,539.68x = 4,073,662,563.80
  5. Step 5: Solve for x
    x = 4,073,662,563.80/72,539.68
  6. Step 6: Final answer
    x = 56,157.71

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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.