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Finding the Fourth Proportional to 117,912.95, 162,409.92 and 90,636.86

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Solution

The fourth proportional to 117,912.95, 162,409.92 and 90,636.86 is: 124,840.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    117,912.95 : 162,409.92 = 90,636.86 : x
  2. Step 2: Convert to fraction form
    117,912.95/162,409.92 = 90,636.86/x
  3. Step 3: Cross multiply
    117,912.95x = 162,409.92 × 90,636.86
  4. Step 4: Simplify right side
    117,912.95x = 14,720,325,181.65
  5. Step 5: Solve for x
    x = 14,720,325,181.65/117,912.95
  6. Step 6: Final answer
    x = 124,840.61

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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.