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Finding the Fourth Proportional to 91,297.38, 126,025.50 and 81,720.35

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Solution

The fourth proportional to 91,297.38, 126,025.50 and 81,720.35 is: 112,805.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,297.38 : 126,025.50 = 81,720.35 : x
  2. Step 2: Convert to fraction form
    91,297.38/126,025.50 = 81,720.35/x
  3. Step 3: Cross multiply
    91,297.38x = 126,025.50 × 81,720.35
  4. Step 4: Simplify right side
    91,297.38x = 10,298,847,968.93
  5. Step 5: Solve for x
    x = 10,298,847,968.93/91,297.38
  6. Step 6: Final answer
    x = 112,805.51

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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.