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Finding the Fourth Proportional to 403.60, 605.34 and 115

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Solution

The fourth proportional to 403.60, 605.34 and 115 is: 172.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.60 : 605.34 = 115 : x
  2. Step 2: Convert to fraction form
    403.60/605.34 = 115/x
  3. Step 3: Cross multiply
    403.60x = 605.34 × 115
  4. Step 4: Simplify right side
    403.60x = 69,614.10
  5. Step 5: Solve for x
    x = 69,614.10/403.60
  6. Step 6: Final answer
    x = 172.48

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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.