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Finding the Fourth Proportional to 81,915.80, 122,643.30 and 73,621.40

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Solution

The fourth proportional to 81,915.80, 122,643.30 and 73,621.40 is: 110,225.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,915.80 : 122,643.30 = 73,621.40 : x
  2. Step 2: Convert to fraction form
    81,915.80/122,643.30 = 73,621.40/x
  3. Step 3: Cross multiply
    81,915.80x = 122,643.30 × 73,621.40
  4. Step 4: Simplify right side
    81,915.80x = 9,029,171,446.62
  5. Step 5: Solve for x
    x = 9,029,171,446.62/81,915.80
  6. Step 6: Final answer
    x = 110,225.03

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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.