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Finding the Fourth Proportional to 81,607.20, 122,410.80 and 70,672.20

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Solution

The fourth proportional to 81,607.20, 122,410.80 and 70,672.20 is: 106,008.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,607.20 : 122,410.80 = 70,672.20 : x
  2. Step 2: Convert to fraction form
    81,607.20/122,410.80 = 70,672.20/x
  3. Step 3: Cross multiply
    81,607.20x = 122,410.80 × 70,672.20
  4. Step 4: Simplify right side
    81,607.20x = 8,651,040,539.76
  5. Step 5: Solve for x
    x = 8,651,040,539.76/81,607.20
  6. Step 6: Final answer
    x = 106,008.30

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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.