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Finding the Fourth Proportional to 403.61, 605.43 and 115.02

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Solution

The fourth proportional to 403.61, 605.43 and 115.02 is: 172.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.61 : 605.43 = 115.02 : x
  2. Step 2: Convert to fraction form
    403.61/605.43 = 115.02/x
  3. Step 3: Cross multiply
    403.61x = 605.43 × 115.02
  4. Step 4: Simplify right side
    403.61x = 69,636.56
  5. Step 5: Solve for x
    x = 69,636.56/403.61
  6. Step 6: Final answer
    x = 172.54

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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.