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Finding the Fourth Proportional to 121,987.35, 182,981.03 and 80,131.95

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Solution

The fourth proportional to 121,987.35, 182,981.03 and 80,131.95 is: 120,197.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,987.35 : 182,981.03 = 80,131.95 : x
  2. Step 2: Convert to fraction form
    121,987.35/182,981.03 = 80,131.95/x
  3. Step 3: Cross multiply
    121,987.35x = 182,981.03 × 80,131.95
  4. Step 4: Simplify right side
    121,987.35x = 14,662,626,346.25
  5. Step 5: Solve for x
    x = 14,662,626,346.25/121,987.35
  6. Step 6: Final answer
    x = 120,197.93

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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.