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Finding the Fourth Proportional to 138,701, 191,433.34 and 79,085

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Solution

The fourth proportional to 138,701, 191,433.34 and 79,085 is: 109,152.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,701 : 191,433.34 = 79,085 : x
  2. Step 2: Convert to fraction form
    138,701/191,433.34 = 79,085/x
  3. Step 3: Cross multiply
    138,701x = 191,433.34 × 79,085
  4. Step 4: Simplify right side
    138,701x = 15,139,505,693.90
  5. Step 5: Solve for x
    x = 15,139,505,693.90/138,701
  6. Step 6: Final answer
    x = 109,152.10

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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.