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Finding the Fourth Proportional to 78,546.60, 117,819.90 and 77,380.20

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Solution

The fourth proportional to 78,546.60, 117,819.90 and 77,380.20 is: 116,070.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,546.60 : 117,819.90 = 77,380.20 : x
  2. Step 2: Convert to fraction form
    78,546.60/117,819.90 = 77,380.20/x
  3. Step 3: Cross multiply
    78,546.60x = 117,819.90 × 77,380.20
  4. Step 4: Simplify right side
    78,546.60x = 9,116,927,425.98
  5. Step 5: Solve for x
    x = 9,116,927,425.98/78,546.60
  6. Step 6: Final answer
    x = 116,070.30

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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.