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Finding the Fourth Proportional to 128,797.85, 192,946.61 and 72,466.20

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Solution

The fourth proportional to 128,797.85, 192,946.61 and 72,466.20 is: 108,558.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,797.85 : 192,946.61 = 72,466.20 : x
  2. Step 2: Convert to fraction form
    128,797.85/192,946.61 = 72,466.20/x
  3. Step 3: Cross multiply
    128,797.85x = 192,946.61 × 72,466.20
  4. Step 4: Simplify right side
    128,797.85x = 13,982,107,810.75
  5. Step 5: Solve for x
    x = 13,982,107,810.75/128,797.85
  6. Step 6: Final answer
    x = 108,558.55

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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.