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Finding the Fourth Proportional to 353,919.20, 530,878.80 and 221,208.80

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Solution

The fourth proportional to 353,919.20, 530,878.80 and 221,208.80 is: 331,813.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    353,919.20 : 530,878.80 = 221,208.80 : x
  2. Step 2: Convert to fraction form
    353,919.20/530,878.80 = 221,208.80/x
  3. Step 3: Cross multiply
    353,919.20x = 530,878.80 × 221,208.80
  4. Step 4: Simplify right side
    353,919.20x = 117,435,062,293.44
  5. Step 5: Solve for x
    x = 117,435,062,293.44/353,919.20
  6. Step 6: Final answer
    x = 331,813.20

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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.