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Finding the Fourth Proportional to 121,755.21, 168,021.70 and 68,040.21

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Solution

The fourth proportional to 121,755.21, 168,021.70 and 68,040.21 is: 93,895.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,755.21 : 168,021.70 = 68,040.21 : x
  2. Step 2: Convert to fraction form
    121,755.21/168,021.70 = 68,040.21/x
  3. Step 3: Cross multiply
    121,755.21x = 168,021.70 × 68,040.21
  4. Step 4: Simplify right side
    121,755.21x = 11,432,231,752.56
  5. Step 5: Solve for x
    x = 11,432,231,752.56/121,755.21
  6. Step 6: Final answer
    x = 93,895.22

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1.5x scale

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.