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Finding the Fourth Proportional to 109,191, 163,611 and 91,695

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Solution

The fourth proportional to 109,191, 163,611 and 91,695 is: 137,395.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,191 : 163,611 = 91,695 : x
  2. Step 2: Convert to fraction form
    109,191/163,611 = 91,695/x
  3. Step 3: Cross multiply
    109,191x = 163,611 × 91,695
  4. Step 4: Simplify right side
    109,191x = 15,002,310,645
  5. Step 5: Solve for x
    x = 15,002,310,645/109,191
  6. Step 6: Final answer
    x = 137,395.12

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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.