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Finding the Fourth Proportional to 72,492.08, 100,039.20 and 40,660.88

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Solution

The fourth proportional to 72,492.08, 100,039.20 and 40,660.88 is: 56,112.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,492.08 : 100,039.20 = 40,660.88 : x
  2. Step 2: Convert to fraction form
    72,492.08/100,039.20 = 40,660.88/x
  3. Step 3: Cross multiply
    72,492.08x = 100,039.20 × 40,660.88
  4. Step 4: Simplify right side
    72,492.08x = 4,067,681,906.50
  5. Step 5: Solve for x
    x = 4,067,681,906.50/72,492.08
  6. Step 6: Final answer
    x = 56,112.09

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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.