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Finding the Fourth Proportional to 121,817.15, 168,111.15 and 68,102.30

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Solution

The fourth proportional to 121,817.15, 168,111.15 and 68,102.30 is: 93,983.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,817.15 : 168,111.15 = 68,102.30 : x
  2. Step 2: Convert to fraction form
    121,817.15/168,111.15 = 68,102.30/x
  3. Step 3: Cross multiply
    121,817.15x = 168,111.15 × 68,102.30
  4. Step 4: Simplify right side
    121,817.15x = 11,448,756,135.54
  5. Step 5: Solve for x
    x = 11,448,756,135.54/121,817.15
  6. Step 6: Final answer
    x = 93,983.12

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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.