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Finding the Fourth Proportional to 121,611.40, 182,481.18 and 86,300.76

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Solution

The fourth proportional to 121,611.40, 182,481.18 and 86,300.76 is: 129,496.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,611.40 : 182,481.18 = 86,300.76 : x
  2. Step 2: Convert to fraction form
    121,611.40/182,481.18 = 86,300.76/x
  3. Step 3: Cross multiply
    121,611.40x = 182,481.18 × 86,300.76
  4. Step 4: Simplify right side
    121,611.40x = 15,748,264,519.70
  5. Step 5: Solve for x
    x = 15,748,264,519.70/121,611.40
  6. Step 6: Final answer
    x = 129,496.61

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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.