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Finding the Fourth Proportional to 218,968.80, 328,501.80 and 100,611.60

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Solution

The fourth proportional to 218,968.80, 328,501.80 and 100,611.60 is: 150,939.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,968.80 : 328,501.80 = 100,611.60 : x
  2. Step 2: Convert to fraction form
    218,968.80/328,501.80 = 100,611.60/x
  3. Step 3: Cross multiply
    218,968.80x = 328,501.80 × 100,611.60
  4. Step 4: Simplify right side
    218,968.80x = 33,051,091,700.88
  5. Step 5: Solve for x
    x = 33,051,091,700.88/218,968.80
  6. Step 6: Final answer
    x = 150,939.73

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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.