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Finding the Fourth Proportional to 141,379.70, 212,069.55 and 81,346.55

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Solution

The fourth proportional to 141,379.70, 212,069.55 and 81,346.55 is: 122,019.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    141,379.70 : 212,069.55 = 81,346.55 : x
  2. Step 2: Convert to fraction form
    141,379.70/212,069.55 = 81,346.55/x
  3. Step 3: Cross multiply
    141,379.70x = 212,069.55 × 81,346.55
  4. Step 4: Simplify right side
    141,379.70x = 17,251,126,252.55
  5. Step 5: Solve for x
    x = 17,251,126,252.55/141,379.70
  6. Step 6: Final answer
    x = 122,019.83

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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.