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Finding the Fourth Proportional to 72,640.25, 100,241.22 and 40,374.71

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Solution

The fourth proportional to 72,640.25, 100,241.22 and 40,374.71 is: 55,715.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,640.25 : 100,241.22 = 40,374.71 : x
  2. Step 2: Convert to fraction form
    72,640.25/100,241.22 = 40,374.71/x
  3. Step 3: Cross multiply
    72,640.25x = 100,241.22 × 40,374.71
  4. Step 4: Simplify right side
    72,640.25x = 4,047,209,534.93
  5. Step 5: Solve for x
    x = 4,047,209,534.93/72,640.25
  6. Step 6: Final answer
    x = 55,715.80

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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.