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Finding the Fourth Proportional to 91,297.89, 126,026.19 and 81,720.86

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Solution

The fourth proportional to 91,297.89, 126,026.19 and 81,720.86 is: 112,806.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,297.89 : 126,026.19 = 81,720.86 : x
  2. Step 2: Convert to fraction form
    91,297.89/126,026.19 = 81,720.86/x
  3. Step 3: Cross multiply
    91,297.89x = 126,026.19 × 81,720.86
  4. Step 4: Simplify right side
    91,297.89x = 10,298,967,999.19
  5. Step 5: Solve for x
    x = 10,298,967,999.19/91,297.89
  6. Step 6: Final answer
    x = 112,806.20

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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.