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Finding the Fourth Proportional to 81,987.80, 122,981.70 and 73,952.60

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Solution

The fourth proportional to 81,987.80, 122,981.70 and 73,952.60 is: 110,928.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,987.80 : 122,981.70 = 73,952.60 : x
  2. Step 2: Convert to fraction form
    81,987.80/122,981.70 = 73,952.60/x
  3. Step 3: Cross multiply
    81,987.80x = 122,981.70 × 73,952.60
  4. Step 4: Simplify right side
    81,987.80x = 9,094,816,467.42
  5. Step 5: Solve for x
    x = 9,094,816,467.42/81,987.80
  6. Step 6: Final answer
    x = 110,928.90

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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.