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Finding the Fourth Proportional to 72,221.92, 99,669.36 and 40,390.80

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Solution

The fourth proportional to 72,221.92, 99,669.36 and 40,390.80 is: 55,741.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,221.92 : 99,669.36 = 40,390.80 : x
  2. Step 2: Convert to fraction form
    72,221.92/99,669.36 = 40,390.80/x
  3. Step 3: Cross multiply
    72,221.92x = 99,669.36 × 40,390.80
  4. Step 4: Simplify right side
    72,221.92x = 4,025,725,185.89
  5. Step 5: Solve for x
    x = 4,025,725,185.89/72,221.92
  6. Step 6: Final answer
    x = 55,741.04

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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.