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Finding the Fourth Proportional to 72,820, 100,485.20 and 40,552.18

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Solution

The fourth proportional to 72,820, 100,485.20 and 40,552.18 is: 55,958.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,820 : 100,485.20 = 40,552.18 : x
  2. Step 2: Convert to fraction form
    72,820/100,485.20 = 40,552.18/x
  3. Step 3: Cross multiply
    72,820x = 100,485.20 × 40,552.18
  4. Step 4: Simplify right side
    72,820x = 4,074,893,917.74
  5. Step 5: Solve for x
    x = 4,074,893,917.74/72,820
  6. Step 6: Final answer
    x = 55,958.44

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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.