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Finding the Fourth Proportional to 72,640.08, 100,249.80 and 40,816.80

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Solution

The fourth proportional to 72,640.08, 100,249.80 and 40,816.80 is: 56,330.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,640.08 : 100,249.80 = 40,816.80 : x
  2. Step 2: Convert to fraction form
    72,640.08/100,249.80 = 40,816.80/x
  3. Step 3: Cross multiply
    72,640.08x = 100,249.80 × 40,816.80
  4. Step 4: Simplify right side
    72,640.08x = 4,091,876,036.64
  5. Step 5: Solve for x
    x = 4,091,876,036.64/72,640.08
  6. Step 6: Final answer
    x = 56,330.83

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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.