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Finding the Fourth Proportional to 72,642.87, 100,249.74 and 40,811.13

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Solution

The fourth proportional to 72,642.87, 100,249.74 and 40,811.13 is: 56,320.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,642.87 : 100,249.74 = 40,811.13 : x
  2. Step 2: Convert to fraction form
    72,642.87/100,249.74 = 40,811.13/x
  3. Step 3: Cross multiply
    72,642.87x = 100,249.74 × 40,811.13
  4. Step 4: Simplify right side
    72,642.87x = 4,091,305,171.61
  5. Step 5: Solve for x
    x = 4,091,305,171.61/72,642.87
  6. Step 6: Final answer
    x = 56,320.81

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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.