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Finding the Fourth Proportional to 139,164.80, 208,581.08 and 76,000.79

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Solution

The fourth proportional to 139,164.80, 208,581.08 and 76,000.79 is: 113,910.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,164.80 : 208,581.08 = 76,000.79 : x
  2. Step 2: Convert to fraction form
    139,164.80/208,581.08 = 76,000.79/x
  3. Step 3: Cross multiply
    139,164.80x = 208,581.08 × 76,000.79
  4. Step 4: Simplify right side
    139,164.80x = 15,852,325,436.14
  5. Step 5: Solve for x
    x = 15,852,325,436.14/139,164.80
  6. Step 6: Final answer
    x = 113,910.46

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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.