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Finding the Fourth Proportional to 72,640.84, 100,238.97 and 40,815.04

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Solution

The fourth proportional to 72,640.84, 100,238.97 and 40,815.04 is: 56,321.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,640.84 : 100,238.97 = 40,815.04 : x
  2. Step 2: Convert to fraction form
    72,640.84/100,238.97 = 40,815.04/x
  3. Step 3: Cross multiply
    72,640.84x = 100,238.97 × 40,815.04
  4. Step 4: Simplify right side
    72,640.84x = 4,091,257,570.11
  5. Step 5: Solve for x
    x = 4,091,257,570.11/72,640.84
  6. Step 6: Final answer
    x = 56,321.73

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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.