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Finding the Fourth Proportional to 141,805.20, 212,707.80 and 78,819.60

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Solution

The fourth proportional to 141,805.20, 212,707.80 and 78,819.60 is: 118,229.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    141,805.20 : 212,707.80 = 78,819.60 : x
  2. Step 2: Convert to fraction form
    141,805.20/212,707.80 = 78,819.60/x
  3. Step 3: Cross multiply
    141,805.20x = 212,707.80 × 78,819.60
  4. Step 4: Simplify right side
    141,805.20x = 16,765,543,712.88
  5. Step 5: Solve for x
    x = 16,765,543,712.88/141,805.20
  6. Step 6: Final answer
    x = 118,229.40

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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.