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Finding the Fourth Proportional to 72,696.90, 100,321.17 and 40,431.80

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Solution

The fourth proportional to 72,696.90, 100,321.17 and 40,431.80 is: 55,795.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,696.90 : 100,321.17 = 40,431.80 : x
  2. Step 2: Convert to fraction form
    72,696.90/100,321.17 = 40,431.80/x
  3. Step 3: Cross multiply
    72,696.90x = 100,321.17 × 40,431.80
  4. Step 4: Simplify right side
    72,696.90x = 4,056,165,580.39
  5. Step 5: Solve for x
    x = 4,056,165,580.39/72,696.90
  6. Step 6: Final answer
    x = 55,795.58

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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.