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Finding the Fourth Proportional to 218,880.80, 328,321.20 and 125,309.60

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Solution

The fourth proportional to 218,880.80, 328,321.20 and 125,309.60 is: 187,964.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,880.80 : 328,321.20 = 125,309.60 : x
  2. Step 2: Convert to fraction form
    218,880.80/328,321.20 = 125,309.60/x
  3. Step 3: Cross multiply
    218,880.80x = 328,321.20 × 125,309.60
  4. Step 4: Simplify right side
    218,880.80x = 41,141,798,243.52
  5. Step 5: Solve for x
    x = 41,141,798,243.52/218,880.80
  6. Step 6: Final answer
    x = 187,964.40

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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.