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Finding the Fourth Proportional to 72,960.71, 100,685.78 and 39,426.71

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Solution

The fourth proportional to 72,960.71, 100,685.78 and 39,426.71 is: 54,408.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,960.71 : 100,685.78 = 39,426.71 : x
  2. Step 2: Convert to fraction form
    72,960.71/100,685.78 = 39,426.71/x
  3. Step 3: Cross multiply
    72,960.71x = 100,685.78 × 39,426.71
  4. Step 4: Simplify right side
    72,960.71x = 3,969,708,348.62
  5. Step 5: Solve for x
    x = 3,969,708,348.62/72,960.71
  6. Step 6: Final answer
    x = 54,408.85

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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.