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Finding the Fourth Proportional to 92,278.45, 138,321.69 and 66,916.54

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Solution

The fourth proportional to 92,278.45, 138,321.69 and 66,916.54 is: 100,305.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,278.45 : 138,321.69 = 66,916.54 : x
  2. Step 2: Convert to fraction form
    92,278.45/138,321.69 = 66,916.54/x
  3. Step 3: Cross multiply
    92,278.45x = 138,321.69 × 66,916.54
  4. Step 4: Simplify right side
    92,278.45x = 9,256,008,823.72
  5. Step 5: Solve for x
    x = 9,256,008,823.72/92,278.45
  6. Step 6: Final answer
    x = 100,305.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.