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Finding the Fourth Proportional to 138,786, 191,524.68 and 79,170

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Solution

The fourth proportional to 138,786, 191,524.68 and 79,170 is: 109,254.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,786 : 191,524.68 = 79,170 : x
  2. Step 2: Convert to fraction form
    138,786/191,524.68 = 79,170/x
  3. Step 3: Cross multiply
    138,786x = 191,524.68 × 79,170
  4. Step 4: Simplify right side
    138,786x = 15,163,008,915.60
  5. Step 5: Solve for x
    x = 15,163,008,915.60/138,786
  6. Step 6: Final answer
    x = 109,254.60

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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.