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Finding the Fourth Proportional to 121,897.70, 168,205.20 and 68,181.62

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Solution

The fourth proportional to 121,897.70, 168,205.20 and 68,181.62 is: 94,083.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,897.70 : 168,205.20 = 68,181.62 : x
  2. Step 2: Convert to fraction form
    121,897.70/168,205.20 = 68,181.62/x
  3. Step 3: Cross multiply
    121,897.70x = 168,205.20 × 68,181.62
  4. Step 4: Simplify right side
    121,897.70x = 11,468,503,028.42
  5. Step 5: Solve for x
    x = 11,468,503,028.42/121,897.70
  6. Step 6: Final answer
    x = 94,083.01

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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.