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Finding the Fourth Proportional to 92,409.09, 137,945.15 and 81,199.05

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Solution

The fourth proportional to 92,409.09, 137,945.15 and 81,199.05 is: 121,211.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,409.09 : 137,945.15 = 81,199.05 : x
  2. Step 2: Convert to fraction form
    92,409.09/137,945.15 = 81,199.05/x
  3. Step 3: Cross multiply
    92,409.09x = 137,945.15 × 81,199.05
  4. Step 4: Simplify right side
    92,409.09x = 11,201,014,726.11
  5. Step 5: Solve for x
    x = 11,201,014,726.11/92,409.09
  6. Step 6: Final answer
    x = 121,211.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.