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Finding the Fourth Proportional to 81,771.60, 122,661.45 and 42,405.60

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Solution

The fourth proportional to 81,771.60, 122,661.45 and 42,405.60 is: 63,610.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,771.60 : 122,661.45 = 42,405.60 : x
  2. Step 2: Convert to fraction form
    81,771.60/122,661.45 = 42,405.60/x
  3. Step 3: Cross multiply
    81,771.60x = 122,661.45 × 42,405.60
  4. Step 4: Simplify right side
    81,771.60x = 5,201,532,384.12
  5. Step 5: Solve for x
    x = 5,201,532,384.12/81,771.60
  6. Step 6: Final answer
    x = 63,610.50

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1.5x scale

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.