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Finding the Fourth Proportional to 72,739.86, 100,380.35 and 40,908.08

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Solution

The fourth proportional to 72,739.86, 100,380.35 and 40,908.08 is: 56,452.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,739.86 : 100,380.35 = 40,908.08 : x
  2. Step 2: Convert to fraction form
    72,739.86/100,380.35 = 40,908.08/x
  3. Step 3: Cross multiply
    72,739.86x = 100,380.35 × 40,908.08
  4. Step 4: Simplify right side
    72,739.86x = 4,106,366,886.33
  5. Step 5: Solve for x
    x = 4,106,366,886.33/72,739.86
  6. Step 6: Final answer
    x = 56,452.77

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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.