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Finding the Fourth Proportional to 404.02, 605.99 and 172.78

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Solution

The fourth proportional to 404.02, 605.99 and 172.78 is: 259.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.02 : 605.99 = 172.78 : x
  2. Step 2: Convert to fraction form
    404.02/605.99 = 172.78/x
  3. Step 3: Cross multiply
    404.02x = 605.99 × 172.78
  4. Step 4: Simplify right side
    404.02x = 104,702.95
  5. Step 5: Solve for x
    x = 104,702.95/404.02
  6. Step 6: Final answer
    x = 259.15

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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.