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Finding the Fourth Proportional to 81,405.60, 122,108.40 and 61,447.20

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Solution

The fourth proportional to 81,405.60, 122,108.40 and 61,447.20 is: 92,170.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,405.60 : 122,108.40 = 61,447.20 : x
  2. Step 2: Convert to fraction form
    81,405.60/122,108.40 = 61,447.20/x
  3. Step 3: Cross multiply
    81,405.60x = 122,108.40 × 61,447.20
  4. Step 4: Simplify right side
    81,405.60x = 7,503,219,276.48
  5. Step 5: Solve for x
    x = 7,503,219,276.48/81,405.60
  6. Step 6: Final answer
    x = 92,170.80

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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.