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Finding the Fourth Proportional to 218,963.80, 328,218.90 and 118,912.60

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Solution

The fourth proportional to 218,963.80, 328,218.90 and 118,912.60 is: 178,245.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,963.80 : 328,218.90 = 118,912.60 : x
  2. Step 2: Convert to fraction form
    218,963.80/328,218.90 = 118,912.60/x
  3. Step 3: Cross multiply
    218,963.80x = 328,218.90 × 118,912.60
  4. Step 4: Simplify right side
    218,963.80x = 39,029,362,768.14
  5. Step 5: Solve for x
    x = 39,029,362,768.14/218,963.80
  6. Step 6: Final answer
    x = 178,245.73

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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.