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Finding the Fourth Proportional to 218,975.80, 328,439.40 and 61,220.20

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Solution

The fourth proportional to 218,975.80, 328,439.40 and 61,220.20 is: 91,823.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,975.80 : 328,439.40 = 61,220.20 : x
  2. Step 2: Convert to fraction form
    218,975.80/328,439.40 = 61,220.20/x
  3. Step 3: Cross multiply
    218,975.80x = 328,439.40 × 61,220.20
  4. Step 4: Simplify right side
    218,975.80x = 20,107,125,755.88
  5. Step 5: Solve for x
    x = 20,107,125,755.88/218,975.80
  6. Step 6: Final answer
    x = 91,823.51

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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.