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Finding the Fourth Proportional to 81,740.40, 122,610.60 and 42,309.60

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Solution

The fourth proportional to 81,740.40, 122,610.60 and 42,309.60 is: 63,464.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,740.40 : 122,610.60 = 42,309.60 : x
  2. Step 2: Convert to fraction form
    81,740.40/122,610.60 = 42,309.60/x
  3. Step 3: Cross multiply
    81,740.40x = 122,610.60 × 42,309.60
  4. Step 4: Simplify right side
    81,740.40x = 5,187,605,441.76
  5. Step 5: Solve for x
    x = 5,187,605,441.76/81,740.40
  6. Step 6: Final answer
    x = 63,464.40

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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.