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Finding the Fourth Proportional to 121,611.88, 182,694.54 and 87,981.64

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Solution

The fourth proportional to 121,611.88, 182,694.54 and 87,981.64 is: 132,172.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,611.88 : 182,694.54 = 87,981.64 : x
  2. Step 2: Convert to fraction form
    121,611.88/182,694.54 = 87,981.64/x
  3. Step 3: Cross multiply
    121,611.88x = 182,694.54 × 87,981.64
  4. Step 4: Simplify right side
    121,611.88x = 16,073,765,248.25
  5. Step 5: Solve for x
    x = 16,073,765,248.25/121,611.88
  6. Step 6: Final answer
    x = 132,172.66

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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.